Update readme

README.md

@@ -1,3 +1,19 @@
 # koboldgen
 
-A character/one-shot generator for KOBOLDS IN SPACE!
+A character/one-shot generator for KOBOLDS IN SPACE! Requires Python 3.6+.
+
+Invoke the script directly to generate a single kobold:
+
+`python3 koboldgen.py`
+
+Type a number after the name of the script to generate that many kobolds:
+
+`python3 koboldgen.py 3`
+
+generates 3 kobolds.
+
+Use the `--campaign` or `-c` flags to generate a full campaign with 6 kobolds:
+
+`python3 koboldgen.py --campaign`
+`python3 koboldgen.py -c`
+