Add issue templates

Hopefully gives less package bug reports opened in termux-app

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve termux-app
+
+---
+
+<!-- Important note: Refusing to provide needed information may result in issue closing. If you are having problems with a package in termux then a bug report should be filed in the termux-packages repo: https://github.com/termux/termux-packages -->
+
+**Problem description**
+A clear and concise description of what the problem with the termux app is. You may post screenshots in addition to description.
+
+**Steps to reproduce**
+Please post all steps that are needed to reproduce the issue.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional information**
+Post output of command `termux-info`.
+If you are rooted or have access to adb then capture a logcat with `logcat -d "*:W"`, from a adb or root shell.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature in termux-app
+
+---
+
+**Feature description**
+Describe the feature and why you want it.
+
+**Reference implementation**
+Does another app/terminal emulator have this feature?
+Provide links to more background information