Moved the 'cats' to the persistence dir and added nav item and an index page.

navigation.md

@@ -13,6 +13,7 @@
   * [Windows](persistence/windows/index.md)
   * [Linux](persistence/linux/index.md)
   * [OSX](persistence/osx/index.md)
+  * [Universal](persistence/multi/index.md)
 
 [Pivoting]()
 

persistence/multi/index.md

@@ -0,0 +1,7 @@
+# Universal Persistence Commands
+
+Commands that help you maintain control over a compromised system.
+
+  * [ncat](ncat.md) - "Ncat is a feature-packed networking utility which reads and writes data across networks from the command line."
+  * [netcat](netcat.md) - The original and venerable "swiss-army knife" of network communications tools.
+  * [socat](socat.md) - "socat is a relay for bidirectional data transfer between two independent data channels."