Include github issue template

.github/ISSUE_TEMPLATE.md

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+If you'd like to submit a Repo to the Azure Serverless Community Library, fill out the following template:
+
+- Title: What you'd like your sample to be called.
+________
+
+- Description: A short block of text (~100 characters max) explaining what your sample does.
+________
+
+- Template: The path to the ARM template which deploys the application. For more information, see the [README](https://github.com/Azure/FunctionLibrary/blob/master/README.md).
+________
+
+- Repository: The URL of a public git repository.
+________
+
+- Language (optional): The language your code is written in (Functions only.)
+________
+
+- Technology (optional): Whether your app is a Function App or a Logic App
+________
+
+- Solution Area (optional): A broad level categorization of what type of solution you've built (IoT, ML, Data Processing, ...)
+________