Update issue templates

Trying out adding issue templates, probably will change them up still.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,28 @@
+---
+name: Bug Report
+about: Report a bug to help us improve
+title: 'Bug: [this doesn''t work]'
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**System (please complete the following information):**
+ - OS: 
+- Tmux Version:

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: 'Enhancement: [add this functionality]'
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the feature you'd like**
+A clear and concise description of what you want added to this project.
+
+**Describe risks you've considered**
+A clear and concise description of some potential risks of adding such a feature.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.