chore: update issue templates with guidelines (#17505)

.github/ISSUE_TEMPLATE.md

@@ -1,38 +0,0 @@
-<!--
-Thanks for opening an issue! A few things to keep in mind:
-
-- The issue tracker is only for bugs and feature requests.
-- Before reporting a bug, please try reproducing your issue against
-  the latest version of Electron.
-- If you need general advice, join our Slack: http://atom-slack.herokuapp.com
--->
-
-* Output of `node_modules/.bin/electron --version`:
-* Operating System (Platform and Version):
-
-<!-- If this used to work -->
-* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable):
-
-### Expected behavior
-
-<!-- What do you think should happen? -->
-
-### Actual behavior
-
-<!-- What actually happens? -->
-
-### How to reproduce
-
-<!-- 
-
-Your best chance of getting this bug looked at quickly is to provide a REPOSITORY that can be cloned and run.
-
-You can fork https://github.com/electron/electron-quick-start and include a link to the branch with your changes.
-
-If you provide a URL, please list the commands required to clone/setup/run your repo e.g.
-
-  $ git clone $YOUR_URL -b $BRANCH
-  $ npm install
-  $ npm start || electron .
-
--->

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -4,6 +4,18 @@ about: Create a report to help us improve Electron
 
 ---
 
+<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
+-->
+
+### Preflight Checklist
+<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->
+
+* [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
+* [ ] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
+* [ ] I have searched the issue tracker for an issue that matches the one I want to file, without success.
+
+### Issue Details
+
 * **Electron Version:**
   * <!-- (output of `node_modules/.bin/electron --version`) e.g. 4.0.3 -->
 * **Operating System:**
@@ -23,7 +35,7 @@ Your best chance of getting this bug looked at quickly is to provide a REPOSITOR
 -->
 
 <!--
-You can fork [electron-quick-start](https://github.com/electron/electron-quick-start) and include a link to the branch with your changes.
+You can fork electron-quick-start (https://github.com/electron/electron-quick-start) and include a link to the branch with your changes.
 -->
 
 <!--

.github/ISSUE_TEMPLATE/Feature_request.md

@@ -4,6 +4,16 @@ about: Suggest an idea for Electron
 
 ---
 
+<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
+-->
+
+### Preflight Checklist
+<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->
+
+* [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
+* [ ] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
+* [ ] I have searched the issue tracker for an feature request that matches the one I want to file, without success.
+
 ### Problem Description
 <!-- Is your feature request related to a problem? PLease add a clear and concise description of what the problem is. -->
 

.github/ISSUE_TEMPLATE/mac_app_store_private_api_rejection.md

@@ -4,6 +4,17 @@ about: Your app was rejected from the Mac App Store for using private API's
 
 ---
 
+<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
+-->
+
+### Preflight Checklist
+<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->
+
+* [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
+* [ ] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
+
+### Issue Details
+
 * **Electron Version:** 
   * <!-- (output of `node_modules/.bin/electron --version`) e.g. 4.0.3 -->