First set of 'motors' topics (#305)

* Start of 'motors' topics

* Draft the 'motor motion' side doc

* Add / update more topics

* Last blast of edits

* Capture some more edits

* Put in movement and steering details

docs/reference/motors/motor/reset.md

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+# reset
+
+Reset the motor's speed setting and it's counters.
+
+```sig
+motors.largeA.reset()
+```
+
+The motor's speed is set back to `0` and the **tacho**, **angle**, and **speed** counters are set to `0`.
+
+## Example
+
+See what the angle count is when a motor is stopped. Then, try it again after a reset.
+
+```blocks
+motors.largeA.setSpeed(30)
+loops.pause(2000)
+motors.largeA.stop()
+brick.showString("Angle count:", 1)
+brick.showNumber(motors.largeA.angle(), 2)
+motors.largeA.setSpeed(30)
+loops.pause(2000)
+motors.largeA.reset()
+brick.showString("Angle count:", 4)
+brick.showNumber(motors.largeA.angle(), 5)
+```
+
+## See also
+
+[stop](/reference/motors/motor/stop), [clear counts](/reference/motors/motor/clear-counts)