added resource pack, building and running info

README.md

@@ -9,4 +9,35 @@ This forks improves the game by adding most of the features found in the origina
 including shops, messages, healing and grid modifying (BitMan attack).
 The zones are the most important lacking feature.
 
-This repository does not yet include any resources or content packs.
+## Resource Packs
+
+Unzip these in `~/.nightfall/AddOns/`.
+
+* [NightfallPack](https://www.kaivos.org/pelit/NightfallPack.zip): Contains textures from the original _The Nightfall Incident_.
+* [DevPack](https://www.kaivos.org/pelit/DevPack.zip): Contains tutorial and remakes of levels from the original game.
+* [HackerBases](https://www.kaivos.org/pelit/HackerBases.zip): A small story of a hacker whose employer's servers are corrupted.
+
+```sh
+mkdir -p ~/.nightfall/AddOns
+cd ~/.nightfall/AddOns
+wget https://www.kaivos.org/pelit/{NightfallPack,DevPack,HackerBases}.zip
+unzip NightfallPack.zip
+unzip DevPack.zip
+unzip HackerBases.zip
+```
+
+The game will not work without NightfallPack and DevPack! If you launched the game before installing them, remove `~/.nightfall/SaveData.json` and install the packs.
+
+## Compiling
+
+There is a prebuilt version in the releases section.
+
+```
+make nightfall.jar
+```
+
+## Running
+
+```
+java -cp nightfall.jar game.WMain
+```