lm32: todo and documentation

This patch adds general target documentation and a todo list.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
diff --git a/target-lm32/TODO b/target-lm32/TODO
new file mode 100644
index 0000000..b9ea0c8
--- /dev/null
+++ b/target-lm32/TODO
@@ -0,0 +1,3 @@
+* disassembler (lm32-dis.c)
+* linux-user emulation
+* native bp/wp emulation (?)