Add game 'life' api reference (#1569)

docs/reference/game/remove-life.md

@@ -0,0 +1,33 @@
+# remove Life
+
+Decrease the number of lives remaining by some amount.
+
+```sig
+game.removeLife(0)
+```
+
+The life count in the game is decreased by the number of lives you say. If the life count reaches `0` when these lives are removed, then the game is over.
+
+## Parameters
+
+* **life**: a [number](/types/number) to remove from the count.
+
+## Example #example
+
+Take away `20` lives count if the player's score reaches `10000` points.
+
+```blocks
+let giveLives = true
+
+if (game.score() > 9999) {
+    if (giveLives) {
+        game.removeLife(20)
+        giveLives = false
+    }
+}
+```
+
+## See also #seealso
+
+[set life](/reference/game/set-life),
+[add life](/reference/game/add-life)