Add templates

ISSUE_TEMPLATE.md

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+### Are you in the right place?
+* For issues or feature requests file a GitHub issue in this repository
+* For general questions or discussion post in [Gitter](https://gitter.im/piotrmurach/tty)
+
+### Describe the problem
+A brief description of the issue/feature.
+
+### Steps to reproduce the problem
+```
+Your code here to reproduce the issue
+```
+
+### Actual behaviour
+What happened? This could be a description, log output, error raised etc...
+
+### Expected behaviour
+What did you expect to happen?
+
+### Describe your environment
+
+* OS version:
+* Ruby version:
+* TTY::Font version:

PULL_REQUEST_TEMPLATE.md

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+### Describe the change
+What does this Pull Request do?
+
+### Why are we doing this?
+Any related context as to why is this is a desirable change.
+
+### Benefits
+How will the library improve?
+
+### Drawbacks
+Possible drawbacks applying this change.
+
+### Requirements
+Put an X between brackets on each line if you have done the item:
+[] Tests written & passing locally?
+[] Code style checked?
+[] Rebased with `master` branch?
+[] Documentaion updated?