chore: add issue and pr templates

.github/ISSUE_TEMPLATE.md

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+<!-- Issues that don't use this template are likely to be closed. -->
+<!-- Please search the existing issues and read the documentation before opening an issue. -->
+
+### Current behaviour
+
+<!-- What's currently happening? -->
+
+### Expected behaviour
+
+<!-- What do you expect to happen? If there is an error, provide the complete error message with stack trace. -->
+
+### Code sample
+
+<!-- Provide a complete code sample that could be run to reproduce the issue, ideally on snack.expo.io or in a github repo. -->
+
+### Screenshots (if applicable)
+
+<!-- Include screenshots if there's a bug in the layout. -->
+
+### What have you tried
+
+<!-- List down the steps you have tried to fix or identify the issue and links to any related issues you found. -->
+
+### Your Environment
+
+| software              | version
+| --------------------- | -------
+| ios or android        |
+| react-native          |
+| react-native-paper    |
+| node                  |
+| npm or yarn           |

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please provide enough information so that others can review your pull request. -->
+<!-- Keep pull requests small and focused on a single change. -->
+
+### Motivation
+
+<!-- What existing problem does the pull request solve? Can you solve the issue with a different approach? -->
+
+### Test plan
+
+<!-- List the steps with which we can test this change. Provide screenshots if this changes anything visual. -->