Revise the templates in .github (#772)

Author: seratch

.github/ISSUE_TEMPLATE/01_question.md

@@ -0,0 +1,56 @@
+---
+name: Question
+about: Submit a question about this SDK
+title: (Set a clear title describing your question)
+labels: 'question'
+assignees: ''
+---
+
+## Description
+
+(Describe your issue and goal here)
+
+### Reproducible in:
+
+```bash
+pip freeze | grep slack
+python --version
+sw_vers && uname -v # or `ver`
+```
+
+#### The Slack SDK version
+
+(Paste the output of `pip freeze | grep slack`)
+
+#### Python runtime version
+
+(Paste the output of `python --version`)
+
+#### OS info
+
+(Paste the output of `sw_vers && uname -v` on macOS/Linux or `ver` on Windows OS)
+
+#### Steps to reproduce:
+
+(Share the commands to run, source code, and project settings (e.g., setup.py))
+
+1.
+2.
+3.
+
+### Expected result:
+
+(Tell what you expected to happen)
+
+### Actual result:
+
+(Tell what actually happened with logs, screenshots)
+
+## Requirements (place an `x` in each of the `[ ]`)
+
+(For general questions/issues about Slack API platform or its server-side, could you submit questions at https://my.slack.com/help/requests/new instead. :bow:)
+
+* [ ] This is a question specific to this SDK project.
+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue [here](https://github.com/slackapi/python-slackclient/issues).

.github/ISSUE_TEMPLATE/02_enhancement.md

@@ -0,0 +1,24 @@
+---
+name: Enhancement / Feature Request
+about: Submit an enhancement/feature request
+title: (Set a clear title describing your idea)
+labels: 'enhancement'
+assignees: ''
+---
+
+## Description
+
+(Describe your issue and goal here)
+
+### Category (place an `x` in each of the `[ ]`)
+
+* [ ] **slack.web.WebClient** (Web API client)
+* [ ] **slack.webhook.WebHookClient** (Incoming Webhook, response_url sender)
+* [ ] **slack.web.classes** (UI component builders)
+* [ ] **slack.rtm.RTMClient** (RTM client)
+
+## Requirements (place an `x` in each of the `[ ]`)
+
+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue [here](https://github.com/slackapi/python-slackclient/issues).

.github/ISSUE_TEMPLATE/03_document.md

@@ -0,0 +1,21 @@
+---
+name: Document
+about: Submit an issue on documents
+title: (Set a clear title describing your idea)
+labels: 'docs'
+assignees: ''
+---
+
+## Description
+
+(Describe your issue and goal here)
+
+### The page URLs
+
+* https://slack.dev/python-slackclient/
+
+## Requirements (place an `x` in each of the `[ ]`)
+
+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue [here](https://github.com/slackapi/python-slackclient/issues).

.github/ISSUE_TEMPLATE/04_bug.md

@@ -0,0 +1,56 @@
+---
+name: Bug
+about: Report the SDK bug
+title: (Set a clear title describing the issue)
+labels: 'bug'
+assignees: ''
+---
+
+## Bug Report
+
+(Filling out the following details about bugs will help us solve your issue sooner.)
+
+### Reproducible in:
+
+```bash
+pip freeze | grep slack
+python --version
+sw_vers && uname -v # or `ver`
+```
+
+#### The Slack SDK version
+
+(Paste the output of `pip freeze | grep slack`)
+
+#### Python runtime version
+
+(Paste the output of `python --version`)
+
+#### OS info
+
+(Paste the output of `sw_vers && uname -v` on macOS/Linux or `ver` on Windows OS)
+
+#### Steps to reproduce:
+
+(Share the commands to run, source code, and project settings (e.g., setup.py))
+
+1.
+2.
+3.
+
+### Expected result:
+
+(Tell what you expected to happen)
+
+### Actual result:
+
+(Tell what actually happened with logs, screenshots)
+
+## Requirements (place an `x` in each of the `[ ]`)
+
+(For general questions/issues about Slack API platform or its server-side, could you submit questions at https://my.slack.com/help/requests/new instead. :bow:)
+
+* [ ] This is a bug specific to this SDK project.
+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackapi/python-slackclient/blob/main/.github/contributing.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue [here](https://github.com/slackapi/python-slackclient/issues).

.github/contributing.md

@@ -52,7 +52,7 @@ If the contribution doesn't meet the above criteria, you may fail our automated
 3.  :herb: Create a new branch and check it out.
 4.  :crystal_ball: Make your changes and commit them locally. Magic happens here!
 5.  :arrow_heading_up: Push your new branch to your fork. (e.g. `git push username fix-issue-16`).
-6.  :inbox_tray: Open a Pull Request on github.com from your new branch on your fork to `master` in this
+6.  :inbox_tray: Open a Pull Request on github.com from your new branch on your fork to `main` in this
     repository.
 
 ## Maintainers