Add Python solution to challenge 158

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diff --git a/challenge-158/paulo-custodio/python/ch-1.py b/challenge-158/paulo-custodio/python/ch-1.py
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+#!/usr/bin/env python3
+
+# Challenge 158
+#
+# TASK #1 > Additive Primes
+# Submitted by: Mohammad S Anwar
+# Write a script to find out all Additive Primes <= 100.
+#
+# Additive primes are prime numbers for which the sum of their decimal digits
+# are also primes.
+#
+#
+# Output
+# 2, 3, 5, 7, 11, 23, 29, 41, 43, 47, 61, 67, 83, 89
+
+from sympy import isprime, nextprime
+
+def additive_primes(limit):
+    out = []
+    prime = 2
+    while prime < limit:
+        if isprime(sum(int(digit) for digit in str(prime))):
+            out.append(prime)
+        prime = nextprime(prime)
+    return out
+
+print(", ".join(map(str, additive_primes(100))))