ICM: Strategies section added.

Author: dmitry-ivanov

README.md

@@ -32,3 +32,14 @@ Prevents overlapping for artisan console commands.
     ```
 
 ## Strategies
+
+Overlapping can be prevented by various strategies:
+
+- `file` (default)
+- `mysql`
+- `redis`
+- `memcache`
+- `memcached`
+
+File strategy is fine for a small applications, which are deployed on a single server.
+If your application is more complex and for example, is deployed on a several nodes, then you probably would like to use some other mutex strategy.