Update issue templates and add pull request template

Author: smiklosovic

.github/issue_template.md renamed to .github/ISSUE_TEMPLATE/bug_report.md

@@ -1,3 +1,14 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**It is strongly preferable to create an issue in [Apache JIRA Cassandra project](https://issues.apache.org/jira/projects/CASSANDRA/issues/).**
+
 Please answer these questions before submitting your issue. Thanks!
 
 ### What version of Cassandra are you using?

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,24 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**It is strongly preferable to create an issue in [Apache JIRA Cassandra project](https://issues.apache.org/jira/projects/CASSANDRA/issues/).**
+
+Please answer these questions before submitting your issue. Thanks!
+
+**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.

.github/pull_request_template.md

@@ -0,0 +1,23 @@
+Thanks for sending a pull request! Here are some tips if you're new here:
+
+ * Reflect JIRA ticket number in the pull request title 
+ * Be sure to keep the PR description updated to reflect all changes.
+ * Write your PR title to summarize what this PR proposes.
+ * If possible, provide a concise example to reproduce the issue for a faster review.
+ 
+Commit messages should follow the following format:
+
+```
+<One sentence description, usually Jira title or CHANGES.txt summary>
+
+<Optional lengthier description (context on patch)>
+
+patch by <Authors>; reviewed by <Reviewers> for CASSANDRA-#####
+
+Co-authored-by: Name1 <email1>
+Co-authored-by: Name2 <email2>
+
+```
+
+The [Cassandra Jira](https://issues.apache.org/jira/projects/CASSANDRA/issues/)
+