Add description of recommended settings for VS Code (PowerShell#4054)

Author: iSazonov

.github/CONTRIBUTING.md

@@ -61,6 +61,10 @@ To run the spellchecker, follow the steps as follows:
 
 ## Contributing to Code
 
+### Code Editor
+
+You should use the multi-platform [Visual Studio Code (VS Code)][use-vscode-editor].
+
 ### Building and testing
 
 #### Building PowerShell
@@ -302,4 +306,5 @@ Once you sign a CLA, all your existing and future pull requests will be labeled
 [open-issue]: https://github.com/PowerShell/PowerShell/issues
 [up-for-grabs]: https://github.com/powershell/powershell/issues?q=is%3Aopen+is%3Aissue+label%3AUp-for-Grabs
 [semantic linefeeds]: http://rhodesmill.org/brandon/2012/one-sentence-per-line/
-[PowerShell-Docs]: https://github.com/powershell/powershell-docs/
+[PowerShell-Docs]: https://github.com/powershell/powershell-docs/
+[use-vscode-editor]: ../docs/learning-powershell/using-vscode.md#editing-with-visual-studio-code

docs/learning-powershell/using-vscode.md

@@ -53,7 +53,7 @@ To exit Visual Studio Code, **File->Exit**.
 
 If you wish to use a specific installation of PowerShell with Visual Studio Code, you will need to add a new variable to your user settings file.
 
-1. Click **File -> Preferences -> User Settings**
+1. Click **File -> Preferences -> Settings**
 2. Two editor panes will appear.
    In the right-most pane (`settings.json`), insert the setting below appropriate for your OS somewhere between the two curly brackets (`{` and `}`) and replace *<version>* with the installed PowerShell version:
 
@@ -71,6 +71,22 @@ If you wish to use a specific installation of PowerShell with Visual Studio Code
 3. Replace the setting with the path to the desired PowerShell executable
 4. Save the settings file and restart Visual Studio Code
 
+#### Configuration settings for Visual Studio Code
+
+By using the steps in the previous paragraph you can add configuration settings in `settings.json`.
+
+We recommend the following configuration settings for Visual Studio Code:
+
+```json
+{
+    "csharp.suppressDotnetRestoreNotification": true,
+    "editor.renderWhitespace": "all",
+    "editor.renderControlCharacters": true,
+    "omnisharp.projectLoadTimeout": 120,
+    "files.trimTrailingWhitespace": true
+}
+```
+
 Debugging with Visual Studio Code
 ----
 ### No-workspace debugging