📝 📖 Add Github issue and contribution templates

Signed-off-by: Jakub Juszczak <netghost03@gmail.com>

.github/CONTRIBUTING.md

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+Thank you for contributing vue-chartjs!
+=========================================
+
+Please follow this steps:
+
+1. Fork it ( https://github.com/aapertureless/vue-chartjs/fork )
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request

.github/ISSUE_TEMPLATE.md

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+
+### Expected Behavior
+
+
+### Actual Behavior
+
+
+
+
+
+### Environment
+- OS: Write here
+- NPM Version: Write here
+

.github/PULL_REQUEST_TEMPLATE.md

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+
+
+### Fix or Enhancement?
+
+
+- [ ] All tests passed
+
+
+### Environment
+- OS: Write here
+- NPM Version: Write here
+