Add README

Author: lucianposton

README.md

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+![Continuous Integration](https://github.com/lucianposton/repoman-ebuild-qa-action/workflows/Continuous%20Integration/badge.svg)
+
+# repoman-ebuild-qa-action
+
+This action runs [repoman](https://wiki.gentoo.org/wiki/Repoman) in an
+ebuild repository to find QA issues.
+
+## Usage
+
+Create a workflow file in your repository e.g. `.github/workflows/repoman.yml`.
+An example workflow file is provided below. For more information, see
+[Creating a workflow file](https://help.github.com/en/articles/configuring-a-workflow#creating-a-workflow-file).
+
+### Example workflow
+
+```yaml
+name: 'Continuous Integration'
+on: [push, pull_request]
+jobs:
+    repoman:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - uses: lucianposton/repoman-ebuild-qa-action@v1
+```
+
+### Optional Inputs
+
+* `repoman_args` -
+            Additional arguments to pass after `repoman full`.
+            Defaults to `-dx`. Note: This parameter will undergo shell
+            wordsplitting and globbing.
+* `path` -
+            Path to cd to before starting repoman. The path is relative
+            to the checked out repository. If unspecified or empty,
+            repoman runs in the root of the repository.
+* `portage_version` -
+            The portage version to download containing repoman e.g.
+            `2.3.80`. `latest` is the default value, which uses the latest
+            released version.
+* `profile` -
+            The gentoo profile to set before running repoman. The default
+            value is `latest`, which will result in using the first
+            profile in `profiles.desc` listed under `SYMLINK_LIB=no`
+            e.g. `default/linux/amd64/17.1`.
+* `gentoo_repo` -
+            Location to install the gentoo ebuild repository. This could
+            be useful if using an old portage version that expects a
+            different location. Default value is `/var/db/repos/gentoo`.
+
+These optional inputs can be specified in the workflow file using the `with`
+keyword [syntax](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstepswith).