Created Keyboard Shortcuts (markdown)

Keyboard-Shortcuts.md

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+## Switch channels
+
+To quickly jump between channels:
+
+__WIN / LINUX:__
+
+```
+CTRL + UP ARROW       # Move up one channel
+CTRL + DOWN ARROW     # Move down
+```
+
+__OS X:__
+
+```
+COMMAND + UP ARROW    # Move up one channel
+COMMAND + DOWN ARROW  # Move down
+```
+
+## Clear buffer
+
+Quickly hides all the messages in the current channel.
+
+_This is the same as `/clear`._
+
+__WIN / LINUX:__
+
+```
+CTRL + L
+```
+
+__OS X:__
+
+```
+COMMAND + L
+```