Create README.md

Author: Xerner

README.md

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+# Android `repo init` and `repo sync` Github Action
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+See [the android repo tool docs for more info](https://source.android.com/docs/setup/reference/repo#init)
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+Inputs
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+- `manifest_url` Specifies the url or git repo to fetch the manifest from. Used in repo init
+- `manifest_branch` Specifies what manifest branch to use. Used in repo init
+- `manifest_filename` Specifies the name of the manifest file to find. Used in repo init