Brick ref topics 02 (#283)

* Add brick button topics

* Add the rest of the brick api

docs/reference/brick/button/was-pressed.md

@@ -0,0 +1,50 @@
+# was Pressed
+
+Check if a button was pressed earlier.
+
+```sig
+brick.buttonEnter.wasPressed()
+```
+
+The fact that a button was pressed earlier is remembered. Once **was pressed** is used, this fact is forgotten and the result is `false` the next time you check with **was pressed** button _state_ is reset). But, if you press the button again before you check with **was pressed**, it will tell you `true`. 
+
+## ~hint
+
+**Touch sensors**
+
+Your @boardname@ has touch sensors that work like buttons. Instead of saying `enter` or `left` as the source button, use a touch sensor block with a sensor name like `touch 1`.
+
+```block
+if (sensors.touch1.wasPressed()) {
+    console.log("Hey, I was pressed.");
+}
+```
+
+Read about [touch sensors](/reference/sensors/touch-sensor) and using them as touch buttons.
+
+## ~
+
+## Returns
+
+* a [boolean](types/boolean): `true` if the button was pressed before, `false` if the button was not pressed before
+
+## Example
+
+Set the brick light to green if the `right` button was pressed before the `left` button. If not, the brick light is turned off when the `left` button is pressed.
+
+```blocks
+brick.buttonLeft.onEvent(ButtonEvent.Click, function() {
+    if (brick.buttonRight.wasPressed()) {
+        brick.setLight(BrickLight.Green)
+    } else {
+        brick.setLight(BrickLight.Off)
+    }
+})
+```
+
+## See also
+
+[is pressed](/reference/brick/button/is-pressed),
+[on event](/reference/brick/button/on-event)
+
+[Touch sensors](/reference/sensors/touch-sensor)