Update docs and minor improvements

- add issue templates
- improve typos in README.md
- add ROADMAP.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,22 @@
+---
+name: "🐛 Bug report"
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+projects: ''
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Additional information**
+
+Kubernetes version:
+Jenkins Operator version:
+
+
+Add error logs about the problem here (operator logs and Kubernetes events).

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,17 @@
+---
+name: "🚀 Feature request"
+about: Suggest an idea for this project
+title: ''
+labels: 'enhancement'
+projects: ''
+assignees: ''
+---
+
+**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 about the feature request here e.g. external links or diagrams, etc.