Update issue templates

Author: chkuang-g

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

@@ -0,0 +1,29 @@
+---
+name: "❓ General question"
+about: Describe this issuPlease use this template to ask general question with the
+  External Dependency Manager for Unity (EDM4U)e template's purpose here.
+title: "[Question] "
+labels: 'type: question'
+assignees: ''
+
+---
+
+<!-- DO NOT DELETE
+validate_template=true
+template_path=.github/ISSUE_TEMPLATE/question.md
+-->
+
+### [READ] For Firebase Unity SDK question, please report to [Firebase Unity Sample](https://github.com/firebase/quickstart-unity/issues/new/choose)
+
+Once you've read this section and determined that your issue is appropriate for this repository, please delete this section.
+
+### [REQUIRED] Please fill in the following fields:
+
+  * Unity editor version: _____
+  * External Dependency Manager version: _____
+  * Source you installed EDM4U: _____ (.unitypackage or Unity Package Manager)
+  * Features in External Dependency Manager in use: _____ (Android Resolver, iOS Resolver, VersionHandler, etc.)
+  * Plugins SDK in use: _____ (Firebase, Admob, Facebook, etc.)
+  * Platform you are using the Unity editor on: _____ (Mac, Windows, or Linux)
+
+### [REQUIRED] Please describe the question here:

.github/ISSUE_TEMPLATE/feature-request.md

@@ -1,7 +1,11 @@
 ---
-name: ➕ Feature request
-about: If you have a feature request for the External Dependency Manager for Unity, file it here.
+name: "➕ Feature request"
+about: If you have a feature request for the External Dependency Manager for Unity,
+  file it here.
+title: "[FR] "
 labels: 'type: feature request'
+assignees: ''
+
 ---
 
 <!-- DO NOT DELETE

.github/ISSUE_TEMPLATE/issue.md

@@ -1,7 +1,11 @@
 ---
-name: 🐞 Bug report
-about: Please use this template to report issues with the External Dependency Manager for Unity (EDM4U)
+name: "\U0001F41E Bug report"
+about: Please use this template to report issues with the External Dependency Manager
+  for Unity (EDM4U)
+title: "[BUG]"
 labels: new
+assignees: ''
+
 ---
 
 <!-- DO NOT DELETE