Update issue templates

Author: maureeungaro

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+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.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Compiler version
+ - Geant4, Meson version
+
+**To Reproduce Compilation Behavior**
+- Configure and Compile commands used
+
+**To Reproduce Run Time Behavior**
+1. Snippet to create geometry, if applicable 
+2. Command line options / yml file
+3. Description of what you expected to happen vs what happened.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.