chore: add github issue and pr templates

.github/ISSUE_TEMPLATE.md

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+## Software versions
+
+* **pact-broker gem version:** eg 2.3.1
+* **pact-broker docker version:** eg 2.3.1-1
+* **OS**: e.g. Mac OSX 10.11.5
+* **pact broker client details:** eg. pact-ruby-standalone CLI v 1.23.0
+
+## Expected behaviour
+
+TBC
+
+## Actual behaviour
+
+TBC
+
+## Steps to reproduce
+
+Provide a repository, gist or reproducable code snippet so that we can test the problem.
+
+## Relevent log files
+
+Please ensure you set logging to `DEBUG` and attach any relevant log files here (or link from a gist).

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull request guidelines
+
+* Please [squash your commits](squash) into one commit.
+* Please use [semantic commit messages](semantic-commit-messages) so that your changes will show up correctly in the generated change log.
+* Please ensure you have followed the guidelines in [CONTRIBUTING.md](./CONTRIBUTING.md)
+* And please remove this text before opening a PR
+
+[semantic-commit-messages]: http://karma-runner.github.io/2.0/dev/git-commit-msg.html
+[squash]: https://github.com/todotxt/todo.txt-android/wiki/Squash-All-Commits-Related-to-a-Single-Issue-into-a-Single-Commit