Added README for examples folder

examples/README.md

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+<img align="right" src="http://bwmarrin.github.io/discordgo/img/discordgo.png">
+DiscordGo Examples
+====
+
+All sub-folders of this path contain various examples that demonstrate 
+how to use DiscordGo for various tasks.  
+
+Please explore the individual folders and give them a try!