Install feature request templates

[no ci]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the intended use case**
+* What your general environment is if it's relevant to the feature request and is not a generic console with a typical Pyenv installation (CI, server with a custom setup, cloud environment, IDE)
+* What you are trying to achieve
+* What specifically you are doing for that regarding Pyenv
+* Where you are stuck
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+[ ] In particular, did you consider [writing a plugin](https://github.com/pyenv/pyenv/blob/master/README.md#pyenv-plugins)? Note that if your plugin has general applicability, you can publish it in the 3rd-party plugin catalog on the Pyenv Wiki as per the link above.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.