(chore): Add GitHub templates (#117)

.github/CONTRIBUTING.md

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+# Contributing
+
+If you discover issues, have ideas for improvements or new features, please
+report them to the [issue tracker][1] of the repository or submit a pull
+request. Please, try to follow these guidelines when you do so.
+
+## Issue reporting
+
+* Check that the issue has not already been reported.
+* Check that the issue has not already been fixed in the latest code
+  (a.k.a. `develop`).
+* Be clear, concise and precise in your description of the problem.
+* Open an issue with a descriptive title and a summary in grammatically correct,
+  complete sentences.
+* Include any relevant code to the issue summary.
+* If you're reporting performance issues it'd be nice if you added some profiling data (Emacs has a built-in profiler).
+
+## Pull requests
+
+* Read [how to properly contribute to open source projects on Github][2].
+* Use a topic branch to easily amend a pull request later, if necessary.
+* Write [good commit messages][3].
+* Mention related tickets in the commit messages (e.g. `[Fix #N] Add missing autoload cookies`)
+* Update the [changelog][5].
+* Use the same coding conventions as the rest of the project.
+* Verify your Emacs Lisp code with `checkdoc` (<kbd>C-c ? d</kbd>).
+* Open a [pull request][4] that relates to *only* one subject with a clear title
+  and description in grammatically correct, complete sentences.
+
+[1]: https://github.com/jethrokuan/org-roam/issues
+[2]: http://gun.io/blog/how-to-github-fork-branch-and-pull-request
+[3]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[4]: https://help.github.com/articles/using-pull-requests
+[5]: https://github.com/jethrokuan/org-roam/blob/master/CHANGELOG.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Something's not working.
+title: ''
+labels: ''
+assignees: 'jethrokuan'
+---
+
+### Description
+
+#### Steps to Reproduce
+<!--
+Example:
+
+1. Load Emacs
+2. Run `org-roam--build-cache-async`
+3. Run `org-roam-find-file`
+...
+-->
+
+
+#### Expected Results
+<!-- Example: File A is there -->
+
+#### Actual Results
+<!-- Example: File A is missing -->
+
+### Versions
+- Emacs (`C-h v emacs-version`): vX.X.X
+- Org-roam commit: https://github.com/jethrokuan/org-roam/commit/commithashhere

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Create a feature request to improve Org-roam
+title: ''
+labels: 'enhancement'
+assignees: 'jethrokuan'
+---
+
+### Brief Abstract
+
+### Long Description
+
+### Proposed Implementation (if any)
+
+### Please check the following:
+- [ ] No similar feature requests

.github/PULL_REQUEST_TEMPLATE.md

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+###### Motivation for this change