lots of changes:

- added man command
- added unit tests
- fixed import+export file parameters (now -o and -r respectively)
- added README + License
- added ci pipelines

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+        interval: "monthly"