copy over issue template (#265)

* copy over issue template

* add review feedback

Co-authored-by: Cynthia Jiang <[email protected]>

.github/ISSUE_TEMPLATE/--general-question.md

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+---
+name: "❓ General question"
+about: Please use this template to ask general question with Firebase Unity SDK
+title: "[Question] "
+labels: 'new, type: question'
+assignees: ''
+
+---
+
+<!-- DO NOT DELETE
+validate_template=true
+template_path=.github/ISSUE_TEMPLATE/--general-question.md
+-->
+
+### [REQUIRED] Please fill in the following fields:
+
+  * Unity editor version: _____
+  * Firebase Unity SDK version: _____
+  * Source you installed the SDK: _____ (.unitypackage or Unity Package Manager)
+  * Problematic Firebase Component: _____ (Auth, Database, etc.)
+  * Other Firebase Components in use: _____ (Auth, Database, etc.)
+  * Additional SDKs you are using: _____ (Facebook, AdMob, etc.)
+  * Platform you are using the Unity editor on: _____ (Mac, Windows, or Linux)
+  * Platform you are targeting: _____ (iOS, Android, and/or desktop)
+  * Scripting Runtime: _____ (Mono, and/or IL2CPP)
+  * Pre-built SDK from the [website](https://firebase.google.com/download/unity) or open-source from this repo: _____
+
+### [REQUIRED] Please describe the question here:

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: ➕ Feature request
+about: If you have a feature request for the Firebase Unity SDK, file it here.
+title: "[FR] "
+labels: 'new, 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
+
+* Firebase Component: _____ (Auth, Core, Database, Firestore, Messaging, Storage, etc)
+
+Describe your use case and/or feature request here.

.github/ISSUE_TEMPLATE/issue.md

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+---
+name: 🐞 Bug report
+about: Please use this template to report issues with the Firebase Unity SDK.
+title: "[Bug] "
+labels: 'new, type: question'
+---
+
+<!-- DO NOT DELETE
+validate_template=true
+template_path=.github/ISSUE_TEMPLATE/issue.md
+-->
+
+### [REQUIRED] Please fill in the following fields:
+
+  * Unity editor version: _____
+  * Firebase Unity SDK version: _____
+  * Source you installed the SDK: _____ (.unitypackage or Unity Package Manager)
+  * Problematic Firebase Component: _____ (Auth, Database, etc.)
+  * Other Firebase Components in use: _____ (Auth, Database, etc.)
+  * Additional SDKs you are using: _____ (Facebook, AdMob, etc.)
+  * Platform you are using the Unity editor on: _____ (Mac, Windows, or Linux)
+  * Platform you are targeting: _____ (iOS, Android, and/or desktop)
+  * Scripting Runtime: _____ (Mono, and/or IL2CPP)
+  * Pre-built SDK from the [website](https://firebase.google.com/download/unity) or open-source from this repo: _____
+
+### [REQUIRED] Please describe the issue here:
+
+(Please list the full steps to reproduce the issue. Include device logs, Unity logs, and stack traces if available.)
+
+#### Steps to reproduce:
+
+Have you been able to reproduce this issue with just the Firebase Unity quickstarts (this GitHub project)?
+What's the issue repro rate? (eg 100%, 1/5 etc)
+
+What happened? How can we make the problem occur?
+This could be a description, log/console output, etc.
+
+If you have a downloadable sample project that reproduces the bug you're reporting, you will
+likely receive a faster response on your issue.
+
+#### Relevant Code:
+
+```
+// TODO(you): code here to reproduce the problem
+```