Brick ref topics 02 (#283)

* Add brick button topics

* Add the rest of the brick api

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

@@ -0,0 +1,53 @@
+# is Pressed
+
+Check if a button is being pressed or not.
+
+```sig
+brick.buttonEnter.isPressed()
+```
+
+## ~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.isPressed()) {
+    console.log("Hey, I feel pressed.");
+}
+```
+
+Read about [touch sensors](/reference/sensors/touch-sensor) and using them as touch buttons.
+
+## ~
+
+## Returns
+
+* a [boolean](types/boolean): `true` if the button is pressed, `false` if the button is not pressed
+
+## Example
+
+Set the brick light to green when the `down` is pressed. When the button is not pressed, the brick light is red.
+
+```blocks
+let isRed = false;
+loops.forever(function() {
+    if (brick.buttonLeft.isPressed()) {
+        brick.setLight(BrickLight.Green);
+        isRed = false;
+    } else {
+        if (!isRed) {
+            brick.setLight(BrickLight.Red);
+            isRed = true;
+        }
+    }
+})
+```
+
+## See also
+
+[was pressed](/reference/brick/button/was-pressed),
+[on event](/reference/brick/button/on-event)
+
+[Touch sensors](/reference/sensors/touch-sensor)

docs/reference/brick/button/on-event.md

@@ -0,0 +1,57 @@
+# on Event
+
+Run some code when a button is clicked, pressed down, or released.
+
+```sig
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+
+});
+```
+
+## ~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
+sensors.touch1.onEvent(TouchSensorEvent.Pressed, function () {
+    brick.setLight(BrickLight.Orange);
+});
+```
+
+Read about [touch sensors](/reference/sensors/touch-sensor) and using them as touch buttons.
+
+## ~
+
+## Parameters
+
+* **ev**: the button action to run some code for. The button actions (events) are:
+> * ``click``: button was clicked (pressed and released)
+> * ``up``: button is released from just being pressed
+> * ``down``: button is just pressed down
+* **body**: the code you want to run when something happens with a button
+
+## Example
+
+Check for event on the ENTER button. Put a message on the screen when the button is pressed, clicked, or released.
+
+```blocks
+brick.showString("ENTER is: UP", 1);
+brick.buttonEnter.onEvent(ButtonEvent.Up, function () {
+    brick.showString("ENTER is: UP      ", 1);
+});
+brick.buttonEnter.onEvent(ButtonEvent.Down, function () {
+    brick.showString("ENTER is: DOWN    ", 1);
+});
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+    brick.showString("ENTER was: CLICKED", 1);
+});
+```
+
+### See also
+
+[is pressed](/reference/brick/button/is-pressed),
+[was pressed](/reference/brick/button/was-pressed),
+
+[Touch sensor](/reference/sensors/touch-sensor)

docs/reference/brick/button/pause-until.md

@@ -0,0 +1,37 @@
+# pause Until
+
+Causes your program to wait until an event at a button happens.
+
+```sig
+brick.buttonEnter.pauseUntil(ButtonEvent.Click);
+```
+
+## Parameters
+
+* **ev**: the button action to wait for. The button actions (events) are:
+> * ``click``: button was clicked (pressed and released)
+> * ``up``: button is released from just being pressed
+> * ``down``: button is just pressed down
+
+## Example
+
+Wait for the `up` button to go up before continuing with displaying a message on the screen.
+
+```blocks
+let waitTime = 0;
+brick.showString("We're going to wait", 1);
+brick.showString("for you to press and", 2);
+brick.showString("release the UP button", 3);
+waitTime = control.millis();
+brick.buttonUp.pauseUntil(ButtonEvent.Click);
+brick.clearScreen();
+if (control.millis() - waitTime > 5000) {
+    brick.showString("Ok, that took awhile!", 1)
+} else {
+    brick.showString("Ah, you let go!", 1)
+}
+```
+
+## See also
+
+[on event](/reference/brick/button/on-event)

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)