Add screen recording wiki page

How-To:-Screen-Recording.md

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+Within raylib, you have the ability to take a screenshot or record the screen to an animated *.gif*.
+
+## Screenshot
+
+To take a screenshot, press `F12`. There will be a screenshot.png file saved to the current working directory.
+
+This requires `SUPPORT_SCREEN_CAPTURE` to be defined.
+
+## Screen Recording
+
+To start recording the screen, press `CTRL + F12`. raylib will start recording an animated gif to the current working directory.
+
+This requires `SUPPORT_GIF_RECORDING` to be defined.