begin shift to nim code base

tests/test1.nim

@@ -0,0 +1,12 @@
+# This is just an example to get you started. You may wish to put all of your
+# tests into a single file, or separate them into multiple `test1`, `test2`
+# etc. files (better names are recommended, just make sure the name starts with
+# the letter 't').
+#
+# To run these tests, simply execute `nimble test`.
+
+import unittest
+
+import src/submodule
+test "correct welcome":
+  check getWelcomeMessage() == "Hello, World!"