Create feature-request.md

Author: chkuang-g

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: ➕ Feature request
+about: If you have a feature request for the External Dependency Manager for Unity, file it here.
+labels: 'type: feature request'
+---
+
+<!-- DO NOT DELETE
+validate_template=true
+template_path=.github/ISSUE_TEMPLATE/feature-request.md
+-->
+
+### [READ] Guidelines
+
+When filing a feature request please make sure the issue title starts with "FR:".
+
+A good feature request ideally
+* is either immediately obvious (i.e. "Add Sign in with Apple support"), or
+* starts with a use case that is not achievable with the existing Firebase API and
+  includes an API proposal that would make the use case possible. The proposed API
+  change does not need to be very specific.
+
+Once you've read this section, please delete it and fill out the rest of the template.
+
+### Feature proposal
+
+* EDM4U Component: _____ (Android Resolver, iOS Resolver, Version Handler, Package Manager, etc)
+
+Describe your use case and/or feature request here.