Add some documentation

README.md

@@ -1,4 +1,22 @@
 # dfmt
 Dfmt is a formatter for D source code
 
-[![Build Status](https://travis-ci.org/Hackerpilot/dfix.svg)](https://travis-ci.org/Hackerpilot/dfix)
+[![Build Status](https://travis-ci.org/Hackerpilot/dfmt.svg)](https://travis-ci.org/Hackerpilot/dfmt)
+
+## Status
+*dfmt* is alpha-quality. Make backups of your files or use source control.
+
+## Building
+### Using Make
+* Clone the repository
+* Run ```git submodule update --init``` in the dfmt directory
+* To compile with DMD, run ```make``` in the dfmt directory. To compile with
+  LDC, run ```make ldc``` instead. The generated binary will be placed in
+  ```dfmt/bin/```.
+
+## Using
+By default, dfmt reads its input from ```stdin``` and writes to ```stdout```.
+If a file name is specified on the command line, input will be read from the
+file instead, and output will be written to ```stdout```. If the ```--inplace```
+option is specified a file name is required and the file will be edited
+in-place.