Add contribution guidelines (#178)

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please create (if there is not one yet) a issue before sending a PR -->
+<!-- Add issue number (Eg: fixes #123) -->
+<!-- Always provide changes in existing tests or new tests -->
+
+Fixes #
+
+### Checklist
+- [ ] My branch is up-to-date with development branch.
+- [ ] Everything works and tested on latest stable Rust.
+- [ ] Coverage and Linting have been applied 
+
+### Current behaviour
+<!-- Describe the code you are going to change and its behaviour -->
+
+### New expected behaviour
+<!-- Describe the new code and its expected behaviour -->
+
+### Change logs
+
+<!-- #### Added -->
+<!-- Edit these points below to describe the new features added with this PR -->
+<!-- - Feature 1 -->
+<!-- - Feature 2 -->
+
+
+<!-- #### Changed -->
+<!-- Edit these points below to describe the changes made in existing functionality with this PR -->
+<!-- - Change 1 -->
+<!-- - Change 1 -->