moved test scripts to new tests dir and made them executable

tests/gcd

@@ -0,0 +1,53 @@
+#!/usr/bin/env curly
+>main
+gto
+:gcd
+=v
+=u
+$u
+$v
+>gcd-loop
+gge
+$u
+=t
+$v
+=u
+$t
+=v
+:gcd-loop
+$v
+0
+>gcd-ret
+gle
+$v
+=t
+$u
+$v
+mod
+=v
+$t
+=u
+>gcd-loop
+gto
+:gcd-ret
+$u
+ret
+:lcm
+=b
+=a
+$a
+$a
+$b
+>gcd
+fun
+div
+$b
+mul
+ret
+:main
+21
+6
+>lcm
+fun
+out
+end