Update issue templates

Author: Yoyozilla

.github/ISSUE_TEMPLATE/-feature-request----title.md

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+---
+name: "[Feature Request] - Title"
+about: Suggest an idea for this project
+title: ''
+labels: Feature Request
+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/ISSUE_TEMPLATE/rc1-bug-report.md

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+---
+name: RC1 Bug report
+about: 'Create a bug report to help us improve '
+title: ''
+labels: RC1 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.
+
+**Your Setup (please complete the following information):**
+ - Unity Version[e.g. 2018.3]
+ - MRTK Version [e.g. v2.0]
+
+**Target Platform (please complete the following information):**
+ - HoloLens 
+ - HoloLens 2
+ - WMR
+ - OpenVR
+
+**Additional context**
+Add any other context about the problem here.