Update documentation

Author: alexrsagen

README.md

@@ -1,2 +1,37 @@
 # gm_securerandom
 A module for generating secure random numbers and strings in Garry's Mod
+
+## API
+
+#### random.Bytes(size)
+
+* size (number) - A whole number representing the amount of bytes you want returned
+
+Generates `size` bytes and returns them as a string.
+
+#### random.Number([min, max])
+
+* min (number, optional, default 0) - The minimum value to generate
+* max (number, optional, default 1) - The maximum value to generate
+
+Generates a number between `min` and `max` and returns it.
+
+## Usage
+
+#### Random bytes
+```lua
+require("securerandom")
+print(util.Base64Encode(random.Bytes(16)))
+```
+
+#### Random number between 0 and 1
+```lua
+require("securerandom")
+print(random.Number())
+```
+
+#### Random number between 5 and 10.5
+```lua
+require("securerandom")
+print(random.Number(5, 10.5))
+```