add screenshot and README

README

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+# Townchest
+
+A minetest mod contains a chest with building definitions. The chest can spawn a NPC that does build the building for you.
+
+## Features
+
+- WorldEdit file target
+  - A Chest that allows you to choose a building and manage the building options
+  - The most WorldEdit files are supported. just put the file to the buildings directory
+  - Flatting and cleanup the building place, remove all cruft-nodes from building inside
+  - Cleanup unknown nodes
+  - Ground level detection trough dirt_with_* nodes
+  - Optimized for realy big buildings. Try the AMMOnym_coloseum.we as a showcase
+
+- Creative build
+  - Instant build allow you to get the building instantly
+  - Creative build by NPC without providing needed nodes
+
+- Builder-NPC's
+  - Multiple NPC's per building can be used (to get Clolseum in time you need ~50 NPC's oO)
+  - NPC can change the assigned building if chest is stopped and an other active chest nearly
+
+## Roadmap (not implemented yet)
+- Survival mode
+  - each NPC gets own inventory
+  - build a node only if there is place in inventory for the old one and the new one is avialable in inventory
+  - Use all nearly default:chest to store removed nodes (flatting) and to get nodes for building
+
+- Node mapping support
+  - a way to change the needed nodes (like in building defined default:wood but I like to use something from moretrees mod)
+  - the mapping should be able to map the unknown nodes
+
+- Support mts files
+
+## Vision / Ideas / maybe
+- other chests that generates a plan. The generated plan can be the daily work of a lumberjack as example
+
+## Credits
+- cornernote - made the towntest mod that was used as template for townchest
+- PilzAdam - made the initial NPC entity movement code (towntest)
+- VanessaE - contributed buildings (towntest)
+- kddekadenz - contributed buildings (towntest)
+- ACDC - contributed buildings (towntest)
+- Nanuk - contributed buildings (towntest) 
+- irksomeduck - contributed buildings (towntest)
+- AMMOnym_coloseum.we https://forum.minetest.net/viewtopic.php?p=121294#p121294
+- PEAK_BremerHaus.we  https://forum.minetest.net/viewtopic.php?p=207103#p207103
+- All contributions welcome!
+
+
+## License 
+BSD-3-Clause