add issue template

ISSUE_TEMPLATE.md

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+Please make our job easier by filling this template out to completion. If you're requesting a feature instead of reporting a bug, please feel free to skip the Environment and Reproducible Demo sections.
+
+## Description
+
+1-2 sentences describing the problem you're having or the feature you'd like to request
+
+## Expected Behavior
+
+What action did you perform, and what did you expect to happen?
+
+## Observed Behavior
+
+What actually happened when you performed the above actions?
+
+If there's an error message, please paste the *full terminal output and error message* in this code block:
+
+```
+Error text goes here!
+```
+
+## Environment
+
+Please run these commands in the project folder and fill in their results:
+
+* `npm ls react-native-calendars`:
+* `npm ls react-native`:
+
+Also specify:
+
+1. Phone/emulator/simulator & version:
+
+## Reproducible Demo
+
+Please provide a minimized reproducible demonstration of the problem you're reporting.
+
+Issues that come with minimal repro's are resolved much more quickly than issues where a maintainer has to reproduce themselves.