Adding dynamic mode doc and updating ashell doc

docs/ashell.md

@@ -8,10 +8,10 @@
 
 Introduction
 ------------
-This shell focus is on creating an interface to be able to run commands and
+The focus of ashell is to create an interface to be able to run commands and
 arbitrary JavaScript directly from the USB port of a Zephyr enabled device.
 
-Although the shell would look like a common Unix Bash, it is heavily limited
+Although this shell looks like a common Unix Bash, it is heavily limited
 due the constraints of the micro-controller.
 
 NOTE: Because the filesystem module is used by ashell, the SPI module is also

docs/dynamic.md

@@ -0,0 +1,34 @@
+Dynamic mode - Adds the ability to run JS from the filesystem
+============================================================
+
+* [Introduction](#introduction)
+* [Compilation](#compilation)
+* [How to use](#howtouse)
+
+Introduction
+------------
+Compiling ZJS in dynamic mode gives you the ability to run a JavaScript file from
+the filesystem of the board. Note that running a new JavaScript file will halt
+the current one. Also note that you need to include all the modules you wish to
+use in the original JavaScript file you compile ZJS with. If the JavaScript you
+try to run from the filesystem calls for a module not included in the original
+JavaScript file, it will fail.
+
+Compilation
+------------
+This command will enable dynamic mode:
+```bash
+$ make dynamic
+```
+
+How to use
+-------
+Build ZJS with ashell, then copy any JavaScript files you want to run onto the
+filesystem using 'save'.
+
+In your primary JavaScript file, use 'runJS('filename.js')' whenever you want to load
+a different JavaScript file from the filesystem. Remember your current JavaScript
+will halt once this command is called. You can add this command anywhere you want
+a different JavaScript to load.
+
+Build ZJS with your primary JavaScript file and reboot.