github: Add PR and issue templates

Signed-off-by: Harsh Shandilya <msfjarvis@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Device information (please complete the following information):**
+ - Device: [e.g. Google Pixel 2]
+ - OS: [e.g. stock ROM Android version 9.0]
+ - App version [e.g. 3.1.0]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEATURE]"
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## :loudspeaker: Type of change
+<!--- Put an `x` in the boxes that apply -->
+- [ ] Bugfix
+- [ ] New feature
+- [ ] Enhancement
+- [ ] Refactoring
+
+
+## :scroll: Description
+<!--- Describe your changes in detail -->
+
+
+## :bulb: Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+
+## :green_heart: How did you test it?
+
+
+## :pencil: Checklist
+<!--- Put an `x` in the boxes that apply -->
+- [ ] I ran `./gradlew spotlessApply` before submitting the PR
+- [ ] I reviewed submitted code
+
+
+## :crystal_ball: Next steps
+
+
+## :camera_flash: Screenshots / GIFs
+<!--- Mandatory for UI changes -->
+<!-- Uncomment the next line and replace it with links to your screenshots. -->
+<!--
+<img src="https://placekitten.com/260/260" width="260">&emsp;<img src="https://placekitten.com/300/300" width="260">
+-->