Add "robot-simulator" exercise

Programming WebAssembly
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I think for this exercise to work on web assembly, it would be better to change the bearing to a number (0 = north, 1 = east, 2 = south, 3 = west) to avoid superfluous string handling; the Return value should be bearing (i32), x (i32) and y (i32). if the bearing is -1, it indicates an error.

So all that needs to be implemented would be an evaluate function that takes the bearing, x, y and offset/length of the instruction string and returns the robot after the instructions were executed.

Is that ok?

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Sounds good.

Globals can be defined for the bearings, like in perfect-numbers and like the status codes in all-your-base

.docs/instructions.append.md should explain the bearing numbers. It can also describe the reserved memory for the instruction string.

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Here we go: new exercise: robot simulator by atk · Pull Request #145 · exercism/wasm · GitHub