README: update usage section

Signed-off-by: Alexander Alemayhu <[email protected]>

README.md

@@ -12,4 +12,21 @@ show the last tuesdays
 
 ## Usage
 
-    last-tuesday-in
+```
+last-tuesday-in --help
+Print out the last tuesdays
+
+USAGE
+  $ last-tuesday-in
+
+OPTIONS
+  -h, --help         show CLI help
+  -m, --month=month  month for filter
+  -n, --name=name    name to print
+  -r, --remainder    print all last remaining tuesdays
+  -v, --version      show CLI version
+  -y, --year=year    year for filter
+
+DESCRIPTION
+  Running without arguments will default ot the current year and month.
+```