Update README.md

README.md

@@ -1,2 +1,38 @@
 # reddit-link-generator
-A simple script that generates purely random reddit short URLs.
+A simple script that generates purely random reddit short URLs. (Yes most of them redirect to a real post.)
+
+# Usage:
+```
+reddit-link-generator.exe N
+```
+Where N represents the number of links you want to generate.
+
+# Modes:
+Currently the program has four modes which can be called with a flag `-m` followed by mode number.
+
+- Mode 1: string with lower case charachters only. `-m1`
+- Mode 2: string with one number at the beggining and rest is lower case charachters. `-m2`
+- Mode 3: string with 10 or 11 at the beggining and rest is lower case charachters. `-m3`
+- Mode 4: string with numbers only. `-m4`
+
+By default, mode 1 is selected if the user doesn't explicitly use the `-m` flag.
+
+# Outputs:
+
+```
+reddit-link-generator.exe 5
+https://reddit.com/cexhlg
+https://reddit.com/xmsdbl
+https://reddit.com/bknbaj
+https://reddit.com/iwkxfp
+https://reddit.com/edwmlb
+```
+
+```
+reddit-link-generator.exe 5 -m3
+https://reddit.com/10pxrv
+https://reddit.com/11koah
+https://reddit.com/10uwie
+https://reddit.com/11bbhs
+https://reddit.com/11vjaa
+```