Add separate issue templates for bugs/feature requests/docs (#235)

* Add separate issue templates for bugs/feature requests/docs

* Use comment

Author: kadikraman

.github/ISSUE_TEMPLATE.md

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+---
+name: ⚠️ Bug/Issue report
+about: Please provide as much detail as possible to help us with a bug or issue.
+---
+
+## Issue
+
+<!-- Please describe your issue here --^ and provide as much detail as you can. -->
+
+---
+
+## Environment
+
+<!-- change `[ ]` to `[x]` to select an option(s) -->
+- **Your Identity Provider**: `e.g. IdentityServer 4 / Okta / Azure`
+- **Platform that you're experiencing the issue on**:
+  - [ ] iOS
+  - [ ] Android
+  - [ ] **iOS** but have not tested behavior on Android
+  - [ ] **Android** but have not tested behavior on iOS
+  - [ ] Both
+- **Are you using Expo, e.g. `ExpoKit`?**
+  - [x] No
+  - [ ] Yes, I've _not_ ejected
+  - [ ] Yes, but I **have** ejected to `ExpoKit`
+  - [ ] Yes, but I **have** ejected to vanilla React Native

.github/ISSUE_TEMPLATE/Bug_Report.md

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+---
+name: 📖 Documentation Feedback
+about: Report an issue with the documentation or suggest an improvement.
+---
+
+## Documentation Feedback
+
+<!-- Please describe your documentation issue or suggested improvement in detail here and provide links to any pre-existing/relevant documentation. -->

.github/ISSUE_TEMPLATE/Documentstion_Issue.md

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+---
+name: 🎁 Feature request
+about: Requesting new features
+---
+
+<!-- Please describe the desired feature, especially detailing the problem it should solve  -->