[Github] Adding templates for ISSUE & PRs and environment script

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: 🐛 Bug Report
+about: Something isn't working as expected
+---
+
+<!--
+    Thanks for contributing to the Swift Argument Parser!
+
+    Before you submit your issue, please replace each paragraph
+    below with the relevant details for your bug, and complete
+    the steps in the checklist by placing an 'x' in each box:
+
+    - [x] I've completed this task
+    - [ ] This task isn't completed
+-->
+
+Replace this paragraph with a short description of the incorrect incorrect behavior. If this is a regression, please note the last version that the behavior was correct in addition to your current version.
+
+**ArgumentParser version:** `0.1.0` or the `master` branch, for example.
+**Swift version:** Paste the output of `swift --version` here.
+
+### Checklist
+- [ ] If possible, I've reproduced the issue using the `master` branch of this package
+- [ ] I've searched for [existing GitHub issues](https://github.com/apple/swift-argument-parser/issues)
+
+### Steps to Reproduce
+Replace this paragraph with an explanation of how to reproduce the incorrect behavior. This could include a code listing for a reduced version of your command, or a link to the code that is exhibiting the issue.
+
+### Expected behavior
+Describe what you expect to happen.
+
+### Actual behavior
+Describe or copy/paste the behavior you observe.

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: 💡 Feature Request
+about: A suggestion for a new feature
+---
+
+<!--
+    Thanks for contributing to the Swift Argument Parser!
+
+    Before you submit your issue, please replace the paragraph
+    below with information about your proposed feature.
+-->
+
+Replace this paragraph with a description of your proposed feature. Code samples that show what's missing, or what new capabilities will be possible, are very helpful! Provide links to existing issues or external references/discussions, if appropriate.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Discussion Forum
+    url: https://forums.swift.org/c/related-projects/argumentparser/60
+    about: Questions about using Swift Argument Parser? Ask here!

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+    Thanks for contributing to the Swift Argument Parser!
+
+    If this pull request adds new API, please add '?template=new.md'
+    to the URL to switch to the appropriate template.
+
+    Before you submit your request, please replace the paragraph
+    below with the relevant details, and complete the steps in the
+    checklist by placing an 'x' in each box:
+
+    - [x] I've completed this task
+    - [ ] This task isn't completed
+-->
+
+Replace this paragraph with a description of your changes and rationale. Provide links to an existing issue or external references/discussions, if appropriate.
+
+### Checklist
+- [ ] I've added at least one test that validates that my change is working, if appropriate
+- [ ] I've followed the code style of the rest of the project
+- [ ] I've read the [Contribution Guidelines](CONTRIBUTING.md)
+- [ ] I've updated the documentation if necessary

.github/PULL_REQUEST_TEMPLATE/NEW.md

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+<!--
+    Thanks for contributing to the Swift Argument Parser!
+
+    Before you submit your request, please replace each paragraph
+    below with the relevant details, and complete the steps in the
+    checklist by placing an 'x' in each box:
+
+    - [x] I've completed this task
+    - [ ] This task isn't completed
+-->
+
+### Description
+Replace this paragraph with a description of your changes and rationale. Provide links to an existing issue or external references/discussions, if appropriate.
+
+### Detailed Design
+Include any additional information about the design here. At minimum, show any new API:
+
+```swift
+/// The new feature implemented by this pull request.
+struct NewFeature {}
+```
+
+### Documentation Plan
+How has the new feature been documented? Have the relevant portions of the guide been updated in addition to symbol-level documentation?
+
+### Test Plan
+How is the new feature tested?
+
+### Source Impact
+What is the impact of this change on existing users? Does it deprecate or remove any existing API?
+
+### Checklist
+- [ ] I've added at least one test that validates that my change is working, if appropriate
+- [ ] I've followed the code style of the rest of the project
+- [ ] I've read the [Contribution Guidelines](CONTRIBUTING.md)
+- [ ] I've updated the documentation if necessary

Scripts/environment.sh

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+#!/bin/bash
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift Argument Parser open source project
+##
+## Copyright (c) 2020 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+##
+##===----------------------------------------------------------------------===##
+
+read -p "This will replace your current pasteboard. Continue? [y/n]" -n 1 -r
+echo    # (optional) move to a new line
+if [[ $REPLY =~ ^[Yy]$ ]]
+then
+	swiftversion=$(swift --version)
+	unix_version_name=$(uname -a | tr ";" '\n')
+	i="${i}Swift version: ${swiftversion}\n"
+	i="${i}Unix version: ${unix_version_name}\n"
+
+	# Check if OS is macOS, if so retrieve which version and Xcode version.
+	if [[ "$OSTYPE" == "darwin"* ]]; then
+		macos=$(defaults read loginwindow SystemVersionStampAsString | cat -)
+		xcodebuild_version=$(/usr/bin/xcodebuild -version | grep Xcode)
+		xcodebuild_build=$(/usr/bin/xcodebuild -version | grep Build)
+		xcodeselectpath=$(xcode-select -p | cat -)
+
+		i="${i}\nmacOS version: ${macos}\n"
+		i="${i}Xcode-select path: '${xcodeselectpath}\n"
+		i="${i}Xcode: ${xcodebuild_version} (${xcodebuild_build})"
+	fi
+
+	echo -e "${i}" | pbcopy
+	echo "Your pasteboard now contains debug info, paste it on Github"
+fi