Convert README to Markdown (#30)

Based on work by @Panquesito7

README.md

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+# Boost Cart
+Based on (and fully compatible with) the mod "carts" by PilzAdam
+and the one contained in the subgame "minetest_game".
+Target: Run smoothly as possible, even on laggy servers.
+
+## Features
+- A fast cart for your railway or roller coaster
+- Easily configurable cart speed using the Advanced Settings
+- Boost and brake rails
+- By mesecons controlled Start-Stop rails
+- Detector rails that send a mesecons signal when the cart drives over them
+- Rail junction switching with the 'right/left' walking keys
+- Handbrake with the 'back' key
+- Support for non-minetest_game subgames
+
+## Settings
+This mod can be adjusted to fit the preference of a player or server. Use the `Settings -> All Settings` dialog in the main menu or tune your
+minetest.conf file manually:
+
+#### `boost_cart.speed_max = 10`
+* Maximal speed of the cart in m/s
+* Possible values: 1 ... 100
+
+#### `boost_cart.punch_speed_max = 7`
+* Maximal speed to which the driving player can accelerate the cart by punching from inside the cart.
+* Possible values: -1 ... 100
+* Value `-1` will disable this feature.
+
+## License for everything
+CC-0, if not specified otherwise below
+
+
+ Authors
+---------
+Various authors
+- carts_rail_*.png
+
+kddekadenz
+- cart_bottom.png
+- cart_side.png
+- cart_top.png
+
+klankbeeld (CC-BY 3.0)
+- http://freesound.org/people/klankbeeld/sounds/174042/
+- cart_rail.*.ogg
+
+Zeg9
+- cart.x
+- cart.png