doc: add README

README.md

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+truedecrypt
+===========
+
+Decrypter for TrueCrypt 4.1-4.3 volumes.
+
+Installing
+----------
+
+```sh
+pip3 install .
+```
+
+Usage
+-----
+
+```
+usage: truedecrypt [-h] [-k KEYFILE] [-p PASSWORD] infile [outfile]
+
+positional arguments:
+  infile
+  outfile
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -k KEYFILE, --keyfile KEYFILE
+  -p PASSWORD, --password PASSWORD
+```
+
+Limitations
+-----------
+
+Many.
+
+License
+-------
+
+```
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+```