Hour of makecode rps (#579)

* local commit

* More reaction fixex

* Local commit

* Convert 'rock paper scissors' to a make project

* Revert the 'reaction time' stuff

* Add image for project page

* Add finished make image in last step

docs/projects/rock-paper-scissors/code.md

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+# Rock Paper Scissors
+
+## Step 1
+
+We want the @boardname@ to choose rock, paper, or scissors when you shake it.
+Place a ``||input:on shake||`` block so when you shake the @boardname@, it will run part of a program.
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    
+})
+```
+
+## Step 2
+
+Add a ``tool`` variable to store a random number computed with ``||math:pick random||``.
+
+When you shake the @boardname@, it should pick a random number from `0` to `2`
+and store it in the variable `tool`. (This variable is named `tool` because 
+rock, paper, and scissors are the tools you use to challenge your friends!)
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    tool = Math.random(3)
+})
+
+```
+
+In a later step, each of the possible numbers (`0`, `1`, or `2`) is matched to its own picture. The picture is shown on the LEDs when its number is picked.
+
+## Step 3
+
+Place an ``if`` block under the ``||math:pick random||`` and
+check whether ``tool`` is equal to ``0``.
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    let tool = Math.random(3)
+    if (tool == 0) {
+    }
+})
+```
+
+## Step 4
+
+In the ``if`` block, place a ``||basic:show leds||`` block that shows a
+picture of a piece of paper.
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    let tool = Math.random(3)
+    if (tool == 0) {
+        basic.showLeds(`
+            # # # # #
+            # . . . #
+            # . . . #
+            # . . . #
+            # # # # #
+            `)
+    }
+})
+```
+
+## Step 5
+
+Add an ``else if`` block to the ``if`` block and check whether ``tool``
+is equal to ``1``.
+
+Click on the gearwheel icon to open up the ``if`` editor; then drag and drop an ``else if`` block in the ``if`` editor.
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    let tool = Math.random(3)
+    if (tool == 0) {
+        basic.showLeds(`
+            # # # # #
+            # . . . #
+            # . . . #
+            # . . . #
+            # # # # #
+            `)
+    } else if (tool == 1) {
+    }
+})
+```
+
+## Step 6
+
+Place a ``||basic:show leds||`` block under the else if and draw a **rock** image on the screen.
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    let tool = Math.random(3)
+    if (tool == 0) {
+        basic.showLeds(`
+            # # # # #
+            # . . . #
+            # . . . #
+            # . . . #
+            # # # # #
+            `)
+    } else if (tool == 1) {
+        basic.showLeds(`
+            . . . . .
+            . # # # .
+            . # # # .
+            . # # # .
+            . . . . .
+            `)
+    }
+})
+```
+
+## Step 7
+
+Add a ``||basic:show leds||`` block with a picture of scissors to the ``else`` part.
+
+You don't need to check if `tool` is `2` because `2` is the only number left out of `0`, `1`, and `2`.
+That's why you can use an ``else`` instead of an ``else if``.
+
+```blocks
+let tool = 0;
+input.onGesture(Gesture.Shake, () => {
+    let tool = Math.random(3)
+    if (tool == 0) {
+        basic.showLeds(`
+            # # # # #
+            # . . . #
+            # . . . #
+            # . . . #
+            # # # # #
+            `)
+    } else if (tool == 1) {
+        basic.showLeds(`
+            . . . . .
+            . # # # .
+            . # # # .
+            . # # # .
+            . . . . .
+            `)
+    } else {
+        basic.showLeds(`
+            # # . . #
+            # # . # .
+            . . # . .
+            # # . # .
+            # # . . #
+            `)
+    }
+})
+
+```
+
+## Step 8
+
+Your game is ready! Gather your friends and play Rock Paper Scissors!