add CONTRIBUTING.md file

CONTRIBUTING.md

@@ -0,0 +1,11 @@
+# Contributing to embedJs
+
+To make a contribution, please follow these steps:
+
+1. Fork and clone this repository
+2. Do the changes on your fork with dedicated feature branch `feature/f1`
+3. Include proper documentation and examples to run the feature
+4. Verify the build is working using `npm run build:local`
+5. Submit a pull request
+
+For more details about pull requests, please read [GitHub's guides](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).