Add new lesson images. (#452)

* Add image to 'Making'

* algorithms-add-image

* Add image

rock paper scissors sketch

* Updated rock paper scissors image

docs/courses/csintro/conditionals/activity.md

@@ -3,7 +3,7 @@
 For this activity, each student will need a micro:bit. 
 Everyone will create the same program, the classic rock paper scissor game.
 
-![Rock, paper, scissors](/static/courses/csintro/conditionals/rock-paper-scissors.jpg)
+![Rock, paper, scissors](/static/courses/csintro/conditionals/rock-paper-scissors.png)
 
 ## Introduce activity
 * Have students recall the classic rock paper scissors game.
@@ -64,4 +64,4 @@ input.onButtonPressed(Button.A, () => {
     basic.showString("Wins:")
     basic.showNumber(game.score())
 })
-```
+```