Created Component computer (markdown)

Component-computer.md

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+Computers provide a couple of API callbacks. Note that these can only be called by the computer itself, or its direct neighbors (i.e. other computers that share a face with that computer). Also note that since robots cannot interact with external components they cannot start/stop/query computers, but computers can interact with robots sitting next to them.
+
+Component name: `computer`.  
+Callbacks:
+- `start(): boolean`  
+  Tries to start the computer. Returns `true` on success, `false` otherwise. Note that this will also return `false` if the computer was already running. If the computer is currently shutting down, this will cause the computer to reboot instead.
+- `stop(): boolean`  
+  Tries to stop the computer. Returns `true` on success, `false` otherwise. Also returns `false` if the computer is already stopped.
+- `isRunning(): boolean`  
+  Returns whether the computer is currently running.
+
+Example use:
+```lua
+local c = component.computer -- get primary computer, e.g. self
+print(c.isRunning()) -- definitely true if it's this computer
+c.stop() -- basically like computer.shutdown() if it's this computer
+```