Document FileLog env variables

* Initial plan

* Document HARMONY_NO_LOG and HARMONY_LOG_FILE environment variables for FileLog

Co-authored-by: pardeike <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: pardeike <[email protected]>

Author: Copilot

Documentation/articles/basics.md

@@ -50,6 +50,22 @@ You can also use Harmony's file logger in your own code:
 
 [!code-csharp[example](../examples/basics.cs?name=log)]
 
+#### Controlling FileLog with Environment Variables
+
+FileLog can be configured using environment variables:
+
+- **`HARMONY_NO_LOG`**: Set to any non-empty value to disable file logging entirely.
+- **`HARMONY_LOG_FILE`**: Set to a custom file path to change where the log file is written.
+
+Example:
+```bash
+# Disable logging
+export HARMONY_NO_LOG=1
+
+# Or use a custom log path
+export HARMONY_LOG_FILE=/path/to/harmony.log.txt
+```
+
 ### Patching using annotations
 
 If you prefer annotations to organize your patches, you instruct Harmony to search for them by using `PatchAll()`:

Documentation/articles/utilities.md

@@ -70,4 +70,21 @@ public static void Reset()
 
 public static unsafe void LogBytes(long ptr, int len)
 // Same as Log(string str) but logs a hex dump and md5 hash.
+```
+
+#### Environment Variables
+
+FileLog can be configured using the following environment variables:
+
+- **`HARMONY_NO_LOG`**: Set this to any non-empty value to disable file logging entirely. When set, all logging calls will be silently ignored and no log file will be created.
+
+- **`HARMONY_LOG_FILE`**: Set this to a custom file path to change where the log file is written. By default, the log file is created at `harmony.log.txt` on your Desktop. Setting this variable allows you to specify an alternative location.
+
+Example usage:
+```bash
+# Disable logging
+export HARMONY_NO_LOG=1
+
+# Or specify a custom log file path
+export HARMONY_LOG_FILE=/path/to/custom/harmony.log.txt
 ```