Add docs folder

Author: marns93

docs/_index.md

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+---
+title: Heroku
+meta_desc: Provides an overview of the Heroku Provider for Pulumi.
+layout: overview
+---
+
+The Heroku provider for Pulumi can be used to provision any of the cloud resources available in Heroku.

docs/installation-configuration.md

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+---
+title: Heroku
+meta_desc: Information on how to install the Pulumi Heroku provider.
+layout: installation
+---
+
+## Installation
+
+The Pulumi Heroku provider is available as a package in all Pulumi languages:
+
+* JavaScript/TypeScript: [`@pulumiverse/heroku`](https://www.npmjs.com/package/@pulumiverse/heroku)
+* Python: [`pulumiverse_heroku`](https://pypi.org/project/pulumiverse_heroku/)
+* Go: [`github.com/pulumiverse/pulumi-heroku/sdk/go/heroku`](https://github.com/pulumiverse/pulumi-heroku/sdk/go/heroku)
+* .NET: [`Pulumiverse.Heroku`](https://www.nuget.org/packages/Pulumiverse.Heroku)
+
+### Provider Binary
+
+The Heroku provider binary is a third party binary. It can be installed using the `pulumi plugin` command.
+
+```bash
+pulumi plugin install resource heroku v0.1.0
+```
+
+Replace the version string with your desired version.