Add issue templates (#5922)

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug report
+about: Create a report to help the OpenTX team to improve OpenTX
+
+---
+*Before submitting,  search the open issue if there is already a report of the bug*
+
+Also often minor bugs are already fixed in nightly builds, often it is
+a good idea to test (in a controlled environment like a bench setup)
+with a nightly firmware to see if the bug still exists.
+
+**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.
+
+**Smartphone (please complete the following information):**
+# General information
+ - OpenTX version (e.g. 2.1.23 or N123)
+ - Hardware (e.g. Frsky X9D+ or 9X Pro)
+ - OpenTX Companion (e.g. 2.1.23 on Ubuntu 16.04)

.github/ISSUE_TEMPLATE/help.md

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+---
+name: Help
+about: Problems or question of using OpenTX
+
+--- 
+
+The issue tracker here is for devlopment of OpenTX. This is not a
+support site, only a bug tracking system. Please use support groups
+like [rcgroups](https://rcgroups.com/) or
+[openrcforum](https://www.openrcforums.com/forum/). See also our
+[manual](https://opentx.gitbooks.io/manual-for-opentx-2-2/).
+
+For quick questions you can also join our general chat.
+
+Issues that fall into the category of asking for help, will be
+generally closed as invalid without an answer.

.github/ISSUE_TEMPLATE/newfeature.md

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+---
+name: Feature request
+about: Suggest an idea for this project to make OpenTX even better
+
+---
+*Before suggesting a new feature here, please search the open issue if there is already a request for the feature*
+
+**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.