Update issue templates

Author: ileitch

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,22 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Reproduction**
+If you are reporting an incorrect result, please provide a sample Xcode or Swift package project that reproduces the issue.
+
+**Environment**
+Copy the output from running:
+```
+periphery version
+swift -version
+xcodebuild -version
+```