Added README for example

examples/mytoken/README.md

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+<img align="right" src="http://bwmarrin.github.io/discordgo/img/discordgo.png">
+MyToken Example
+====
+
+This example demonstrates how to utilize DiscordGo to print out the 
+Authentication Token for a given user account.
+
+### Build
+
+This assumes you already have a working Go environment setup and that 
+DiscordGo is correctly installed on your system.
+
+```sh
+go build
+```
+
+### Usage
+
+You must authenticate using both Email and Password for an account.
+
+```
+./mytoken --help
+Usage of ./mytoken:
+  -e string
+        Account Email
+  -p string
+        Account Password
+```
+
+The below example shows how to start the program using an Email and Password for
+authentication.
+
+```sh
+./mytoken -e EmailHere -p PasswordHere
+```