Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- ❤️ Thank you for your contribution! ❤️ -->
+
+## What
+
+<!--
+  Enter a short description on what this pull-request does.
+  Examples:
+    This PR adds support for the HEVC format.
+    This PR fixes a "unsupported device" error on iPhone 8 and below.
+    This PR fixes a typo in a CameraError.
+    This PR adds support for Quadruple Cameras.
+-->
+
+## Changes
+
+<!--
+  Create a short list of logic-changes.
+  Examples:
+    * This PR changes the default value of X to Y.
+    * This PR changes the configure() function to cache results.
+-->
+
+## Side-effects
+
+<!--
+  Change `[ ]` to `[x]` where it fits:
+-->
+
+* [ ] This PR does not introduce any known side-effects.
+* [ ] This PR introduces the following side-effects: _______
+
+## Tested on
+
+<!--
+  Create a short list of devices and operating-systems you have tested this change on. (And verified that everything works as expected).
+  Examples:
+    * iPhone 11 Pro, iOS 14.3
+    * Huawai P20, Android 10
+-->