Add quick start instructions in README

README.md

@@ -26,11 +26,49 @@ It also adds these server commands:
 
 There's also a setting `schemedit_export_lua` to enable automatic export to .lua files.
 
-## Usage help
-This mod assumes you already have a basic understanding about how schematics in Minetest work.
-If not, refer to the Minetest Lua API documentation to understand more about schematics.
+## Quick Start
 
-To learn how to use all the items in this mod, read `USAGE.md`.
+### Creating a schematic
+
+To create a schematic file:
+
+1. Choose a cuboid area you like to become a schematic
+2. Place a Schematic Creator in front of one of the bottom 4 corners of the area
+3. Use (rightclick) the Schematic Creator
+4. Enter a size and click on “Save size”
+5. Enter a schematic name and click on “Export schematic”
+
+The schematic will be saved in your world directory; you'll see the exact location in chat.
+
+### Importing a schematic
+
+You can import a schematic file if it already exists in your world directory under `schems`.
+Then do the following:
+
+1. Place a schematic creator on the ground
+2. Enter the schematic file name
+3. Click on “Import schematic”
+
+This will both place the schematic and import advanced schematic information
+(probabilities, force-placement).
+
+### Placing a schematic
+
+Use the `/placeschem` chat command to place a schematic as if it were placed by the game.
+This is useful to test a schematic to see the end result.
+
+## Advanced usage
+
+By default, if you export a schematic and place it again, every node will be placed,
+including air.
+
+But you can place a special Schematic Void to mark positions that should not be overridden
+when the schematic is placed. This is very useful for trees.
+
+You can also set probabilities for certain nodes to be placed, or tell the game to
+force-place nodes.
+
+For detailed information read `USAGE.md`.
 
 You can also find the same help texts in-game if you if you use the optional Help modpack
 (mods `doc` and `doc_items`).