Challenge 145 task 1

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diff --git a/challenge-145/jo-37/perl/ch-1.pl b/challenge-145/jo-37/perl/ch-1.pl
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+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+use experimental 'signatures';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV == 2;
+usage: $0 [-examples] [-tests] [X Y]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+X Y
+    two vectors in any representation as accepted by the PDL
+    constructor, e.g.  x1,x2,...
+
+EOS
+
+
+### Input and Output
+
+say dot_product(@ARGV);
+
+
+### Implementation
+
+sub dot_product ($x, $y) {
+    (pdl($x) x pdl($y)->dummy(0))->sclr;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is dot_product([1, 2, 3], [4, 5, 6]), 32, 'example';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}