Add issue and PR templates

Original commit: 389062ec1a

gui/.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug in BaseGL.
+title: ''
+labels: 'Type: Bug'
+assignees: ''
+
+---
+
+<!--
+Please ensure that you are using the latest version of BaseGL before reporting 
+the bug! It may have been fixed since.
+-->
+
+### General Summary
+<!--
+- Please include a high-level description of your bug here.
+-->
+
+### Steps to Reproduce
+<!--
+Please list the reproduction steps for your bug.
+-->
+
+### Expected Result
+<!--
+- A description of the results you expected from the reproduction steps.
+-->
+
+### Actual Result
+<!--
+- A description of what actually happens when you perform these steps.
+- Please include any error output if relevant.
+-->
+
+### Luna Version
+<!--
+- Please include the version of BaseGL you are using here.
+-->

gui/.github/ISSUE_TEMPLATE/epic.md

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+---
+name: Epic
+about: Create a new epic for BaseGL development.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Summary
+<!--
+- This section should summarise the work we want to accomplish during the epic.
+-->
+
+### Value
+<!--
+- A description of the value this epic brings to users.
+- The motivation behind this epic.
+-->
+
+### Specification
+<!--
+- The high-level requirements of the epic.
+- Any performance requirements for the epic.
+-->
+
+### Acceptance Criteria & Test Cases
+<!--
+- The high-level acceptance criteria for the epic.
+- The test plan for the epic.
+-->

gui/.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Request a new feature in BaseGL.
+title: ''
+labels: 'Type: Enhancement'
+assignees: ''
+
+---
+
+<!--
+Please ensure that you check the latest version of BaseGL to see if your feature 
+has been implemented.
+-->
+
+### General Summary
+<!--
+- Describe the feature you are requesting.
+-->
+
+### Motivation
+<!--
+- A description of the motivation for adding this feature to BaseGL.
+- Ideally this would include use-cases that support the feature.
+-->

gui/.github/ISSUE_TEMPLATE/task.md

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+---
+name: Task
+about: Create a new development task for BaseGL.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Summary
+<!--
+- A summary of the task.
+-->
+
+### Value
+<!--
+- This section should describe the value of this task.
+- This value can be for users, to the team, etc.
+-->
+
+### Specification
+<!--
+- Detailed requirements for the feature.
+- The performance requirements for the feature.
+-->
+
+### Acceptance Criteria & Test Cases
+<!--
+- Any criteria that must be satisfied for the task to be accepted.
+- The test plan for the feature, related to the acceptance criteria.
+-->

gui/.github/PULL_REQUEST_TEMPLATE.md

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+### Pull Request Description
+<!--
+- Please describe the nature of your PR here, as well as the motivation for it.
+- If it fixes an open issue, please mention that issue number here.
+-->
+
+### Important Notes
+<!--
+- Mention important elements of the design.
+- Mention any notable changes to APIs.
+-->
+
+### Checklist
+Please include the following checklist in your PR:
+
+- [ ] The documentation has been updated if necessary.
+- [ ] All code conforms to the [Rust](https://github.com/luna/enso/blob/master/doc/rust-style-guide.md), [Scala](https://github.com/luna/enso/blob/master/doc/scala-style-guide.md), [Java](https://github.com/luna/enso/blob/master/doc/java-style-guide.md) or [Haskell](https://github.com/luna/enso/blob/master/doc/haskell-style-guide.md) style guides as appropriate.
+- [ ] All code has been tested where possible.
+