Add installation instructions from Tomas Pospisek <tpo_hp@sourcepole.ch>.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..e17bd80
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,8 @@
+1) Check Config.h and adjust if you need a different functionality than
+   defined by default.
+
+2) Check the Makefile
+
+3) make
+
+4) make install