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/angle.md

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+# angle
+
+Get the current angle of the motor's rotation in degrees.
+
+```sig
+motors.largeA.angle()
+```
+
+When a motor is started for the first time, or after a reset, it's angle of rotation starts at `0` degrees. A complete rotation (a turn in a full circle) is `360` degrees. At `360` degrees, the motor angle gets set back to `0`. So, one and a half turns adds up to `540` degrees of total rotation but the motor only cares about the current angle from `0` degrees which is `180` degrees.
+
+## Returns
+
+* a [number](/types/number) which is the current angle of rotation for the motor. The value returned is the number of degrees from `0` to `359`.
+
+## Example
+
+Reset the motor connected to port **A** and run it for for 2 seconds at a speed of `45`. Stop and get the current angle of rotation.
+
+```blocks
+let motorAngle = 0;
+motors.largeA.reset()
+motors.largeA.setSpeed(45)
+loops.pause(2000)
+motors.largeA.stop()
+motorAngle = motors.largeA.angle()
+```
+
+## See also
+
+[tacho](/reference/motors/motor/tacho), [speed](/reference/motors/motor/speed),
+[reset](/reference/motors/motor/reset), [clear counts](/reference/motors/motor/clear-counts)