Add README.md and initial files (#1)

.github/CODEOWNERS

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+# See for instructions on this file https://help.github.com/articles/about-codeowners/
+
+index.json @derekbekoe
+

.github/ISSUE_TEMPLATE.md

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+- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)
+
+### Extension name (the extension in question)
+
+
+### Description of issue (in as much detail as possible)
+
+-----
+

.github/PULL_REQUEST_TEMPLATE.md

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+
+
+-----
+

README.md

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+# Extensions for Azure CLI 2.0
+
+This repository serves two purposes and they are independent:
+
+1. An `index.json` where you can add your extension and make it available through Azure CLI.
+2. A source code directory, `src`, to host your extension source code.
+
+For documentation on authoring an extension, see [Extension Documentation](https://github.com/Azure/azure-cli/tree/master/doc/extensions)
+
+## About index.json
+
+- Modify the index by creating a PR.
+- All extensions added to the index *are public* and will be available to *all* CLI users.
+- Your extension source code does not have to be in this repository to be available in the index.
+- If you don't want your extension to be part of the index, you can still host it externally and request users to install with `az extension add --source https://contoso.com/mywheel.whl`.
+  * Users will not be able to add your extension by name, it will not be listed in the `az extension list-available` command and to update to a new version of your extension, the user has to first remove the currently installed extension and then add the new version.
+
+Add your extension to the index to make it available in these CLI commands:
+- `az extension add --name NAME` - Allows users to add an extension by name
+- `az extension list-available` - Allows users to list the available extensions in the index
+- `az extension update --name NAME` - Allows users to update an extension
+
+## About source code in this repository
+
+- Extension source code goes into the `src` directory.
+- You can place your source code in this repository by creating a PR.
+- Once CI is green and it has been approved, the PR can be merged.
+- Ensure that you include an appropriate owner for your extension in `.github/CODEOWNERS`.
+- Your extension artifact (i.e. `.whl`) will not live in this repository. You can publish your extension to PyPI or somewhere else such as Azure Storage.
+- If you want your extension to appear in the index.json, modify the index.
+
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a