mlcad: Document usage.

.gitignore

@@ -54,3 +54,9 @@ dkms.conf
 mklist/mklist
 lsynth/lsynthcp
 lsynth/1
+
+# MLCAD
+Parts.lst
+parts.lst
+mlcad/*
+!mlcad/README.md

mlcad/README.md

@@ -0,0 +1,45 @@
+# MLCad
+
+MLCAD (Mike's LEGO CAD) v3.51 by Michael Lachmann.
+
+### What does it do?
+
+MLCAD is a tool to construct virtual LEGO models using the LDraw parts library.
+
+### How to get MLCAD
+
+Download this [archive](http://mlcad.lm-software.com/MLCad_V3.51.zip), and copy the contents of the MLCad_V3.51 *folder* into this folder, so that `MLCAD.exe` is in this folder.
+
+Alternatively, do it automatically using:
+
+```
+wget http://mlcad.lm-software.com/MLCad_V3.51.zip
+unzip MLCad_V3.51.zip
+mv MLCad_V3.51/* .
+rm -rf MLCad_V3.51
+rm MLCad_V3.51.zip
+```
+
+### Usage
+
+MLCAD exists in `exe` format only, for use on Windows.
+
+On Linux, it runs well using wine:
+
+- Set up the wine prefix:
+
+    ```
+    WINEPREFIX=~/.wine-ldraw wine winecfg
+    ```
+
+- Launch MLCAD:
+
+    ```
+    WINEPREFIX=~/.wine-ldraw wine MLCAD.exe
+    ```
+
+  On first use, you will be asked to provide the path to the LDRAW library,
+  which is where you cloned this repository. It will also note that `Parts.lst`
+  does not yet exist. You can proceed to let MLCad create it for you, or use
+  [`mklist`](../mklist).
+