repl: enabled back and added automated tests

fixed typos and macos errors

compiler/tests/repl/README.md

@@ -0,0 +1,14 @@
+# V REPL Tests Script
+
+### How to write a new test
+  - Create a new file named `*.repl`
+  - Write the input to be given to REPL
+  - Add `===output===`
+  - Write the output expected
+
+### Example :
+```
+a := 1
+println(a)
+===output===
+1