Updated README

README.md

@@ -1,3 +1,11 @@
 # gitistics
 
 Git statistics over multiple Git repositories
+
+## Usage
+
+| Option | Description
+| -h | show this help page |
+| -u <user/regex> | set a repository username or a regex pattern (brackets etc. must be escaped with \ ) |
+| -r <directory>  | set a directory with your repositories |
+| -v | show verbose output |