Add GH Issue and PR Templates (#2520)

* add bug templates

* add feature request issue template

* move to singular PR template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: New Bug Report
+about: Use this template for reporting new bugs.
+title: "[BUG]: bug description here"
+labels: bug
+---
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Issue Type
+<!--- Is this an issue with quicktype output, input parsing, or during runtime ? -->
+
+## Context (Environment, Version, Language)
+<!-- What input format and what target output language were you using ? -->
+
+Input Format: 
+Output Language: 
+
+<!-- Please specify how you were using the library (CLI, npm package, or app.quicktype.io) and what version, if applicable -->
+
+CLI, npm, or app.quicktype.io: 
+Version: 
+
+## Description
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Input Data
+<!--- Please provide a snippet of your input data. -->
+<!--- Please truncate if it is too large and ideally isolate to a minimum reproducible example -->
+
+## Expected Behaviour / Output
+<!--- Tell us what should happen / what output should be generated -->
+
+## Current Behaviour / Output
+<!--- Tell us what happens instead of the expected behavior / what output is currently generated -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Possible Solution
+<!--- Optional, suggest a fix/reason for the bug, -->
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+# contact_links:
+# - name: GitHub Community Support
+# url: https://github.com/orgs/community/discussions
+# about: Please ask and answer questions here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Use this template for requesting new features.
+title: "[FEATURE]: feature description here"
+labels: enhancement
+---
+
+<!--- Provide a general summary of the feature in the Title above -->
+
+## Context (Input, Language)
+<!-- What input format and what target output language would this affect ? -->
+
+Input Format: 
+Output Language: 
+
+## Description
+<!--- How would this feature benefit you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Current Behaviour / Output
+<!--- Tell us what happens / what output is currently generated -->
+
+## Proposed Behaviour / Output
+<!--- Tell us what should happen / what output should be generated -->
+
+## Solution
+<!-- Describe or propose a potential solution -->
+
+## Alternatives
+<!-- Please describe any alternatives you have considered and how they do or do not work for you -->
+
+## Context
+<!-- Add any additional context here, if applicable -->

.github/pull_request_template.md

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+## Description
+<!--- Describe your changes in detail -->
+
+## Related Issue
+<!--- If suggesting a new feature or change, please discuss it in an issue first -->
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Previous Behaviour / Output
+<!--- Provide an example of what was happening before your change -->
+
+## New Behaviour / Output
+<!--- Provide an example of what now happens after your change -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran, including any new unit tests --->
+
+## Screenshots (if appropriate):