chore(readme): add simple readme file

README.md

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+# golang-vendor-private
+
+CI plugin to retrieve private go modules in local vendor folder.
+
+Tested with woodpecker-ci >= 3
+
+## Sample
+
+```yaml
+steps:
+  - name: vendor
+    image: forge.e5150.fr/ci-plugins/golang-vendor-private:latest
+    settings:
+      goprivate: forge.e5150.fr
+      login:
+        from_secret: test-username
+      password:
+        from_secret: test-token
+```
+
+## Settings
+
+| Settings name | Type | Description |
+| --------------- | --------------- | --------------- |
+| `goprivate` | string | pattern for private go modules |
+| `login` | string | login to access repository |
+| `password` | string | password to access repository |