Create bug issue template for iOS

.github/ISSUE TEMPLATE/bug_report.md

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+<!-- Before raising, please check if somebody else has already reported your issue. -->
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+### Steps to reproduce
+1. Calling API X
+2. Doing this in the simulator...
+3. Throws error A or collects wrongly data B
+
+### Environment
+* iOS version:
+* Embrace SDK version:
+* Simulator or physical device:
+
+### Additonal context
+Add any other context about the problem here.
+
+<!--
+  Below are a few approaches you might take to communicate the issue, in
+  descending order of awesomeness. Please choose one and feel free to delete
+  the others from this template.
+-->
+
+### Example Repo <!-- Option 1 -->
+
+- [ ] Create a minimal repository that can reproduce the issue
+- [ ] Link to it here:
+
+### Example code snippet <!-- Option 2 -->
+
+```
+# (Insert code sample to reproduce the problem)
+```
+
+<!-- Error messages, if any -->
+<details><summary>Error messages:</summary>
+
+```
+
+```
+</details>