refactor(guide): Refactor installation guide (#427)

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* Update Requirements.md

* Update Requirements.md

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* note to self: next windows

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Ubuntu installation with seperate MariaDB and Oracle MySQL

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Co-authored-by: Nolt <nolt@users.noreply.github.com>
Co-authored-by: Francesco Borzì <borzifrancesco@gmail.com>

1 files changed, 174 insertions, 0 deletions

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+# Linux Requirements
+
+| Installation Guide | |
+| :- | :- |
+| This article is a part of the Installation Guide. You can read it alone or click on the previous link to easily move between the steps. |
+| [<< Start: Installation Guide](installation-guide.md) | [Step 2: Core Installation >>](core-intallation.md) |
+
+| |
+| :- |
+| MySQL ≥ 5.7.0 |
+| CMake ≥ 3.16 |
+| Clang ≥ [6](https://github.com/azerothcore/azerothcore-wotlk/actions?query=workflow%3Acore-build) |
+
+#### Ubuntu with MariaDB 10.x
+
+```sh
+sudo apt update && sudo apt full-upgrade -y && sudo apt install git cmake make gcc g++ clang libssl-dev libbz2-dev libreadline-dev libncurses-dev libace-6.* libace-dev mariadb-server mariadb-client libmariadb-dev libmariadbclient-dev libmariadb-dev-compat
+```
+
+#### Ubuntu with MySQL 8.x
+
+```sh
+sudo apt-get update && sudo apt-get install git cmake make gcc g++ clang libmysqlclient-dev libssl-dev libbz2-dev libreadline-dev libncurses-dev mysql-server libace-6.* libace-dev
+```
+
+Remember that if you are using the `root` user, it is not necessary to use `sudo`.
+
+To configure MySQL in Ubuntu 18.04 and similar (set `root` password and other settings) read [this guide](https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-18-04).
+
+**Note**: in older versions of Ubuntu like **18.04** you need to install gcc 10:
+
+```
+sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+sudo apt-get update
+sudo apt install gcc-10 g++-10
+```
+
+
+--- 
+
+#### Debian 8
+
+```sh
+sudo apt-get update && sudo apt-get install git make gcc g++ clang libmysqlclient-dev libssl1.0-dev libbz2-dev libreadline-dev libncurses-dev mysql-server libace-6.* libace-dev
+```
+
+Remember that if you are using the `root` user, it is not necessary to use `sudo`.
+
+#### Install last cmake version on Debian 8
+
+To install last version of cmake use:
+
+```sh
+sudo apt install python3-pip
+pip3 install --upgrade cmake
+```
+
+If you are using the `root` user
+
+```sh
+apt install python3-pip
+pip3 install --upgrade cmake
+```
+
+Than **reboot** to sync the bash and use cmake from the terminal, than type the followings commands to check the cmake version:
+
+```sh
+cmake --version
+```
+
+You should have a version **>= 3.16**.
+
+Continue below the guide to install the other installation requirements.
+
+**Troubleshooting (cmake install)**: if you get any errors like: `No module named 'skbuild'`, you can solve with this:
+
+```sh
+apt install python3-pip
+pip3 install scikit-build
+pip3 install --upgrade pip
+pip3 install cmake
+```
+
+---
+
+#### Debian 9
+
+```sh
+sudo apt-get update && sudo apt-get install git cmake make gcc g++ clang default-libmysqlclient-dev libssl1.0-dev libbz2-dev libreadline-dev libncurses-dev mysql-server libace-6.* libace-dev
+```
+
+Remember that if you are using the `root` user, it is not necessary to use `sudo`.
+
+You might need to add the stretch-backports repositories to APT in order to install clang-6.x+ and cmake v3.8+.
+If you do not succeed installing cmake you can use the package manager of python3 (pip3)
+
+---
+
+#### Debian 10
+
+```sh
+sudo apt-get update && sudo apt-get install git cmake make gcc g++ clang default-libmysqlclient-dev libssl-dev libbz2-dev libreadline-dev libncurses-dev mariadb-server libace-6.* libace-dev
+```
+
+Remember that if you are using the `root` user, it is not necessary to use `sudo`.
+
+**Note:** If you add the option `-y` and at the end of the list, it will start installing them without the need for you to confirm.
+
+**Example:**
+
+```sh
+apt-get update && apt-get install git cmake make gcc g++ clang default-libmysqlclient-dev libssl-dev libbz2-dev libreadline-dev libncurses-dev mariadb-server libace-6.* libace-dev -y
+```
+
+--- 
+
+
+#### Check your clang version
+
+```sh
+clang --version
+```
+
+Your `clang` version **MUST** be `6` or higher ([here](https://github.com/azerothcore/azerothcore-wotlk/actions?query=workflow%3Acore-build) you can check the versions that run in our Github Actions pipeline, we recommend to use one of those versions).
+
+For example, if you are using an older version of Ubuntu like 16.04, you need to install clang using:
+
+```sh
+sudo apt-get install clang-6.0
+```
+
+If you use another distro or version, search on google for how to install the right clang version for your system.
+
+#### Check your cmake version
+
+```sh
+cmake --version
+```
+
+Your `cmake` version **MUST** be `3.16` or higher.
+
+On an older version of Ubuntu (example: 16.04), you can follow the instructions here in order to install the latest cmake version. On debian you would need to use the backports sources or build Cmake manually.
+
+#### Ensure that the gcc-7 headers are installed
+
+This is an issue if for example using an older version of Ubuntu like 16.04. There you have to add the PPA "Toolchain test builds":
+https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
+
+After
+
+```sh
+sudo apt-get update
+```
+
+you can install gcc-7: 
+
+```sh
+sudo apt-get install g++-7 gcc-7
+```
+
+<br>
+
+## Help
+
+If you are still having problems, check:
+
+* [How to ask for help](How-to-ask-for-help.md)
+
+* [Join our Discord Server](https://discord.gg/gkt4y2x), but it is not a 24/7 support channel. A staff member will answer you whenever they have time.
+
+| Installation Guide | |
+| :- | :- |
+| This article is a part of the Installation Guide. You can read it alone or click on the previous link to easily move between the steps. |
+| [<< Start: Installation Guide](installation-guide.md) | [Step 2: Core Installation >>](core-intallation.md) |