README.md updates

README.md

@@ -1,2 +1,40 @@
-# mdttool
-Simple multiplatform Python tool for manipulating CF card images for the Reactive Micro MicroDrive/Turbo card for the Apple II family
+# MDTTool
+
+MDTTool is a simple multiplatform Python tool for manipulating CF card images
+for the Reactive Micro MicroDrive/Turbo card for the Apple II family.
+
+It is written in Python 3 and licenced under GPL v3.
+
+Usage:
+  mdttool [-haxlCHSG] [-o outputfile] inputfile [inputfile2...]
+
+  -h  Show this help
+  -a  Assemble CF Card image from list of .PO disk images
+  -x  eXplode a CF Card image into constituent partitions
+  -l  Display partition table
+  -C  Set number of cylinders (when assembling new image)
+  -H  Set number of heads (when assembling new image)
+  -S  Set number of sectors (when assembling new image)
+  -G  Set GS ROM version (when assembling new image)
+
+## Display Partition Table
+
+For example:
+```
+mdttool -l cf-card.img
+```
+
+## Explode a CF Card Image into .PO Disk Images
+
+For example:
+```
+mdttool -x cf-card.img
+```
+
+## Assemble a CF Card Image from a list of .PO Disk Images
+
+For example:
+```
+mdttool -a -o new-cf.img part1.po part2.po part3.po
+```
+