Adding a pull request template

.github/pull_request_template.md

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+<!--- Summary of your changes in the Title above --->
+
+## Detail description of your changes
+<!--- Provide a detailed description of your changes
+including motivation and background --->
+
+## Issue ticket number and link
+<!--- not requried for some simple typo corrections --->
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Fixing documentation typo(s)
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+## Checklist before requesting a review
+- [ ] I performed a self-review of my code
+- [ ] I run `mix compile` and it compiles without errors or warnings
+- [ ] I run `mix test` and have **100%** code coverage (and if not I explained below why)
+- [ ] I run `mix credo` and no issues (that weren't there before) were found.
+- [ ] I specified all functions with a type `@spec`
+- [ ] I run `mix dialyzer` and no issues were found
+- [ ] I added module and function documentation to all my public modules/functions
+- [ ] I run `mix docs` and no issues were found
+- [ ] I run through the different `livebook/`s to ensure that they all work.
+- [ ] I added a new livebook (or modified an exisitng one)  to explain the new functionality (only applies for major functionality)