added some initial infos to README.md

README.md

@@ -1,2 +1,21 @@
 # cheat.sheets
-cheat.sh cheat sheets repository 
+
+Own cheat sheets repository of the *cheat.sh*.
+
+If you want to add a cheat sheet to cheat.sh directly,
+add it here (please also consider adding your cheat sheet
+to one of the upstream repositories).
+
+When adding a cheat sheet please use the following format:
+
+```
+# Command1 description 
+# started with some comments
+# and followed with a command example/switches
+command1
+
+# Command2 description
+# Each block separated with an empty line
+command2
+```
+