Add readme, contributing guide, and PR template (#18)

.github/PULL_REQUEST_TEMPLATE/projectTemplate.md

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+Please use this template for each submission
+
+```markdown
+- [Template name](https://www.nuget.org/packages/**packageName**/) - ![GitHub stars](https://img.shields.io/github/stars/**org**/**repo**?style=flat-square&cacheSeconds=604800&logo=microsoft) ![last commit](https://img.shields.io/github/last-commit/**org**/**repo**?style=flat-square&cacheSeconds=86400) Short description of the template.
+```

CONTRIBUTING.md

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+# How to contribute
+
+## Add to the community ASP.NET Core SPA templates list
+
+You can add a project template to the community-owned ASP.NET Core SPA templates listing by submitting a pull request to update [README.md](https://github.com/dotnet/spa-templates/blob/main/README.md). 
+
+Please ensure your pull request adheres to the following:
+
+* Make an individual pull request for each new project template listing.
+* Use the following format: \[NAME\]\(TEMPLATE PACKAGE LINK\) - DESCRIPTION.
+* Keep descriptions simple.
+* End all descriptions with a period.
+* Remove trailing whitespace.
+* Add new listings in alphabetical order.
+* Project templates should be of high quality, maintained, and follow the patterns and conventions used by the templates maintained in this repo.
+* Project templates should be open source and should reference the source project from the package metadata.
+
+See the ASP.NET Core docs for details on [integrating ASP.NET Core with frontend JavaScript frameworks](https://aka.ms/aspnetcorespa) and the .NET docs for instructions on [creating .NET project templates](https://docs.microsoft.com/dotnet/core/tutorials/cli-templates-create-project-template).

README.md

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+# ASP.NET Core Single Page App templates
+
+This repo is home for the ASP.NET Core Single Page App (SPA) project templates for Angular and React that ship as part of the .NET SDK, as well as a listing of community provided templates for using ASP.NET Core with other frontend JavaScript frameworks.
+
+## Community templates
+
+This section is for community project templates for using ASP.NET Core with various frontend JavaScript frameworks. 
+
+> See the [contributing guide](https://github.com/dotnet/spa-templates/blob/main/CONTRIBUTING.md) for details on how to add a project template to this list.
+
+<!--
+Please use this template for each submission:
+
+- [Template name](https://www.nuget.org/packages/**packageName**/) - ![GitHub stars](https://img.shields.io/github/stars/**org**/**repo**?style=flat-square&cacheSeconds=604800&logo=microsoft) ![last commit](https://img.shields.io/github/last-commit/**org**/**repo**?style=flat-square&cacheSeconds=86400) Short description of the template.
+-->