Add contribution doc, issue and pull request templates

.github/CONTRIBUTING.md

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+# Contributing
+
+We love pull requests from everyone.
+
+[Fork](https://help.github.com/articles/fork-a-repo/), then [clone](https://help.github.com/articles/cloning-a-repository/) the repo:
+
+```
+git clone git@github.com:your-username/phonegap-plugin-barcodescanner.git
+```
+
+Set up a branch for your feature or bugfix with a link to the original repo:
+
+```
+git checkout -b my-awesome-new-feature
+git push --set-upstream origin my-awesome-new-feature
+git remote add upstream https://github.com/phonegap/phonegap-plugin-barcodescanner.git
+```
+
+Set up the project:
+
+```
+npm install
+```
+
+Make sure the tests pass before changing anything:
+
+```
+npm test
+```
+
+Make your change. Add tests for your change. Make the tests pass:
+
+```
+npm test
+```
+
+Commit changes:
+
+```
+git commit -m "Cool stuff"
+```
+
+Make sure your branch is up to date with the original repo:
+
+```
+git fetch upstream
+git merge upstream/master
+```
+
+Review your changes and any possible conflicts and push to your fork:
+
+```
+git push origin
+```
+
+[Submit a pull request](https://help.github.com/articles/creating-a-pull-request/).
+
+At this point you're waiting on us. We do our best to keep on top of all the pull requests. We may suggest some changes, improvements or alternatives.
+
+Some things that will increase the chance that your pull request is accepted:
+
+- Write tests.
+- Write a [good commit message](http://chris.beams.io/posts/git-commit/).
+- Make sure the PR merges cleanly with the latest master.
+- Describe your feature/bugfix and why it's needed/important in the pull request description.
+
+
+## Editor Config
+
+The project uses [.editorconfig](http://editorconfig.org/) to define the coding
+style of each file. We recommend that you install the Editor Config extension
+for your preferred IDE. Consistency is key.

.github/ISSUE_TEMPLATE.md

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+### Expected Behaviour
+
+### Actual Behaviour
+
+### Reproduce Scenario (including but not limited to)
+
+#### Steps to Reproduce
+
+#### Platform and Version (eg. Android 5.0 or iOS 9.2.1)
+
+#### (Android) What device vendor (e.g. Samsung, HTC, Sony...)
+
+#### Cordova CLI version and cordova platform version
+
+    cordova --version
+    cordova platforms
+
+#### Plugin version
+
+    cordova plugin version | grep phonegap-plugin-barcodescanner
+
+#### Sample Code that illustrates the problem
+
+#### Logs taken while reproducing problem