Migrate docs from the other repo

docs/reference/game/change-score-by.md

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+# Change Score By
+
+The game library 
+
+The game library supports simple single-player time-based games. The player will ** add points to score**.
+
+## Block Editor
+
+The code below shows a simple game where the user gets to press the button ``A`` as much times as possible and the score will display on the screen.
+
+![](/static/mb/change-score-by-0.png)
+
+## KindScript
+
+The code below shows a simple game where the user gets to press the button ``A`` as much times as possible in 10 seconds.
+
+```
+input.onButtonPressed("A", () => {
+    game.addScore(1)
+})
+game.startCountdown(10000)
+```
+
+### Score
+
+When a player achieves a goal, you can increase the game score
+
+* add score points to the current score
+
+```
+export function addScore(points: number)
+```
+
+* get the current score value
+
+```
+export function score() : number
+```
+
+### Lessons
+
+[bop it](/microbit/lessons/bop-it) | [game of chance](/microbit/lessons/game-of-chance) | [game counter](/microbit/lessons/game-counter)
+