Create issue and PR template for stripe-android (#799)

.github/ISSUE_TEMPLATE.md

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+<!--
+Please only file issues here that you believe represent actual bugs or feature requests for the Stripe Android SDK.
+
+If you're having general trouble with your Stripe integration, please reach out to support using the form at https://support.stripe.com/ (preferred) or via email to [email protected].
+
+Otherwise, to make it easier to diagnose your issue, please fill out the following:
+-->
+
+## Summary
+<!-- A simple summary of the problems you're having. -->
+
+## Code to reproduce
+<!-- If possible, please include a brief piece of code (or ideally, a link to an example project) demonstrating the problem you're having. -->
+
+## Android version
+<!-- What version of Android are you observing the problem on? -->
+
+## Impacted devices
+<!-- Are there specific devices that you are observing the problem on? -->
+
+## Installation method
+<!-- How did you install our SDK? -->
+
+## SDK version
+<!--
+What version of our SDK are you using? You can find this by looking at the `dependencies` section of your project's `build.gradle` file.
+ -->
+
+## Other information
+<!-- Anything else you can include that'll make it easier for us to help you! -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+<!-- Simple summary of what was changed. -->
+
+## Motivation
+<!-- Why are you making this change? If it's for fixing a bug, if possible, please include a code snippet or example project that demonstrates the issue. -->
+
+## Testing
+<!-- How was the code tested? Be as specific as possible. -->