Create README.md

Author: kyanny

README.md

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+# gh-browse-compare
+
+A `gh` extension to aim to be a replacement of `hub compare`.
+
+```
+$ gh browse-compare v1.0.0..main
+$ gh browse-compare v1.0.0...main
+```
+
+You may want to add an alias.
+
+```
+$ gh alias set compare 'browse-compare'
+```
+
+This extension is an experimental implementation, so that it does not validate the command line argument and error handling is rough.
+
+I created this extension rather than directly contributing to `cli/cli` to close https://github.com/cli/cli/issues/4433 because I need to comply with [this guidance](https://github.com/cli/cli/blob/trunk/docs/working-with-us.md). If I get a positive feedback, I am happy to submit a pull request to `cli/cli`.