Renames README files consistently.

go/README.md

@@ -0,0 +1,21 @@
+# GO Starter
+
+- Run :
+
+```shell
+go run gilded-rose.go
+```
+
+- Run tests :
+
+```shell
+go test
+```
+
+- Run tests and coverage :
+
+```shell
+go test -coverprofile=coverage.out
+
+go tool cover -html=coverage.out
+```