Update README.md (#58)

Moving logging instructions from PlayFabPartyUnity repo to the PlayFab repo for better centralization. 

Adding more clarity to the WSL limitation message in response to a customer question

Author: rachelwu1

README.md

@@ -11,7 +11,39 @@ Please download, unzip, and copy the corresponding asset folder for your platfor
 * Win32 - The win32 binaries are not included in the zip assets. They are available on download on [nuget](https://www.nuget.org/packages/Microsoft.PlayFab.PlayFabParty.Cpp.Windows).
 * Linux - `/x64/Release/libparty.so`
 
+## Logging
+The underlying Party C++ library includes logging capabilities with a configurable verbosity level. Logging configuration is defined in `PlayFabPartyLogger.json` file which can be deployed as an asset along with the application. An example of configuration file:
+
+```json
+{
+    "enabled": false,
+    "bufferSize": 16384,
+    "maxNumberOfItemsInBatch": 100,
+    "maxBatchWaitTimeInSeconds": 1,
+    "readBufferWaitTimeInMilliseconds": 1,
+    "logFolder": "/platform-specific-path/",
+    "logLevel": "VERBOSE",
+    "xrnLogEnabled": false,
+    "consoleEnabled": false,
+    "maxLogFileSizeInMegabytes": 0
+}
+```
+
+When this file is detected by the application in runtime it will use it to enable logging as configured. The following verbosity levels are currently supported:
+1. `VERBOSE` - everything
+2. `INFO` - less than everything, only important messages and errors
+3. `ERROR` - only errors
+
+The logging is disabled by default, but can be enabled with "enabled" property set to `true`.
+
+Instructions to enable logging for specific platform.
+Platform|Where to put PlayFabPartyLogger.json (permission needed)|`logFolder` value|How to view logs
+|-|-|-|-|
+Linux|Create a folder "/home/{user}/PlayFabParty/" where {user} is the current user logged in | /home/{user}/PlayFabParty/log/ | Navigate to the `/home/{user}/PlayFabParty/log/` directory and open logs directly
+iOS|Inside the application folder (Set UIFileSharingEnabled to true in the Info.plist of the app)|/app_sandbox_storage/Documents/|Copy logs from `logFolder` to PC
+Android|Create a folder "\sdcard\PlayFabParty\config" (External storage folder requires READ_EXTERNAL_STORAGE permission)|/sdcard/PlayFabParty/log/|Copy logs from `logFolder` to PC and open in NotePad++
+macOS|~/Documents (Set UIFileSharingEnabled to true in the Info.plist of the app)|~/Documents|Open logs directly in `logFolder`
 
 ## WSL Compatibility
 
-PlayFab Party for Linux is not intended to run on the Windows Subsystem for Linux (WSL). Please run on a dedicated Linux machine to take advantage of all Party features.
+PlayFab Party for Linux is not intended to run on the Windows Subsystem for Linux (WSL) as it does not have built in support for system sound. As a result, chat features will not function properly. Please run on a dedicated Linux machine to take advantage of all Party features.