GitHub: Add issue and pull request templates

Change-Id: I5b4ad0e2b1c5c6d886b8355c167ef9e137d1c349

Author: saleemrashid

.github/ISSUE_TEMPLATE.md

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+- [ ] I am running an official build of TWRP, downloaded from https://twrp.me/Devices/
+- [ ] I am running the latest version of TWRP
+- [ ] I have read the FAQ (https://twrp.me/FAQ/)
+- [ ] I have searched for my issue and it does not already exist
+
+**Device codename**: <!-- Device codename -->
+**TWRP version**: <!-- TWRP version installed -->
+
+#### WHAT STEPS WILL REPRODUCE THE PROBLEM?
+<!-- Explain the steps necessary to reproduce the problem, as completely as possible -->
+
+#### WHAT IS THE EXPECTED RESULT?
+<!-- Explain what the expected result is, as completely as possible -->
+
+#### WHAT HAPPENS INSTEAD?
+<!-- Explain what happens instead, as completely as possible -->
+
+#### ADDITIONAL INFORMATION
+<!-- Add any additional information you know about the issue, such as possible causes and solutions -->
+
+<!-- Use https://paste.omnirom.org/ and upload `/tmp/recovery.log` and the output of `dmesg` -->
+`/tmp/recovery.log`: <!-- Link here -->
+`dmesg`: <!-- Link here -->

.github/PULL_REQUEST_TEMPLATE.md

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+# WE DO NOT MERGE PULL REQUESTS SUBMITTED HERE
+
+You will need to submit it through [OmniRom Gerrit](https://gerrit.omnirom.org/#/admin/projects/android_bootable_recovery/)
+
+For changes to device trees, use [TWRP Gerrit](https://gerrit.twrp.me/)
+
+This guide explani how to use [Gerrit code review](https://forum.xda-developers.com/general/xda-university/guide-using-gerrit-code-review-t3720802)