Update README, add brief tutorial.

README.md

@@ -9,6 +9,23 @@ The game is *libre* software: the AGPLv3 license permits you to do whatever
 you want with the source code provided you grant the same permissions to other
 people.
 
+It is recommended to read `TUTORIAL.md` to get started.
+
+
+## Features
+
+* You can create any vehicle using basic blocks. There are quite a few blocks to
+  give your creations detail as well as functional blocks such as wheels, weapons,
+  ...
+
+* The damage system is voxel-based: vehicles are torn down block-by-block.
+
+* The game supports multiplayer. You can join any server and host your own too.
+
+* Since the game is entirely free (as in [freedom][gnu free sw]) you can modify
+  it to any extent. In fact, I highly encourage people to tinker with it and
+  experiment with what works & doesn't work.
+
 
 ## Building the game.
 
@@ -31,3 +48,22 @@ been tested for Linux so far.
    in the `README` of `godot_rapier3d` to build the engine.
 
 2) Use the `Makefile` in this repository to build the game.
+
+
+## Downloads
+
+You can find stable releases [here](https://github.com/Demindiro/OwnWar/releases)
+
+
+## Gallery
+
+![Start menu](https://static.salt-inc.org/own_war/ownwar_start_menu.jpg)
+
+![Editor](https://static.salt-inc.org/own_war/ownwar_editor.jpg)
+
+![Test map](https://static.salt-inc.org/own_war/ownwar_test_map.jpg)
+
+![The Pit](https://static.salt-inc.org/own_war/ownwar_the_pit.jpg)
+
+
+[gnu free sw]: https://www.gnu.org/philosophy/free-sw.en.html

TUTORIAL.md

@@ -0,0 +1,30 @@
+# Beginner's tutorial
+
+This is a brief tutorial for players who are new to this game. It is still
+very much a work-in-progress and will at some point be replaced with an
+in-game guide.
+
+
+## Creating a basic vehicle.
+
+A valid vehicle has a few basic requirements:
+
+* There must be **exactly** one mainframe. You can find the mainframe block in
+  the `Other` tab in the inventory (you can open it with) E.
+
+* All blocks must be connected. All bodies that do not have a mainframe must
+  have **exactly** one connection to a parent body.
+
+
+### Creating turrets.
+
+1) Place a turret block on a body (e.g. the main body).
+
+2) Create a new layer, which is done with the `+` in the bottom-left window.
+
+3) Make sure you switched to the new layer. The previous body should now be
+   transparent.
+
+4) Place blocks on top of the turret block.
+
+5) Repeat this process for sub-turrets.

gd/blocks/weapons/plasma/cannon.tres

@@ -30,10 +30,10 @@ surfaces/1 = {
 
 [resource]
 script = ExtResource( 1 )
-revision = 1
-human_category = "Weapons"
-mass = 1.0
 human_name = "Plasma Cannon"
+mass = 1.0
+human_category = "Weapons"
+revision = 1
 aabb = AABB( 0, 0, 0, 1, 1, 3 )
 id = 90
 health = 100