Update BUILDING.md

Author: bziemons

.idea/codeStyles/Project.xml

@@ -22,7 +22,7 @@ to be enabled)
 
 The channels are all linked to Discord and some even to IRC.
 
-## Setting Up
+## How to set up a local development environment
 
 ### git
 
@@ -31,10 +31,27 @@ want to browse the source, you can clone the official repository. But it is best
 practice to actually fork the repository and clone your own copy.
 
 The git command line is `git clone https://github.com/RS485/LogisticsPipes.git`
-where you can replace RS485 by your own user name, **if** you forked the
+where you can replace *RS485* by your own user name, **if** you forked the
 repository.
 
-### Development environment
+### Gradle
 
-[Here is a video](https://streamable.com/a2cjb) that shows how to set up your
-repository and development environment with the prerequisites above.
+After cloning you can build LP with `./gradlew build` and find the output in
+`build/libs`. If the task fails there may be something wrong with maven
+repositories or [a Java update broke ForgeGradle 2](https://github.com/MinecraftForge/ForgeGradle/issues/652)
+or something may be wrong with your setup. You may definitely ask for help on
+the mentioned communication channels above, but please be sure to state your
+issue as good as possible and be nice to others.
+
+### Running Minecraft from your dev environment
+
+After you successfully built LP you can probably run Minecraft directly from
+your IDE. There may be a ton of missing texture errors and missing language
+files though and this problem even happens when using a new clean mod template,
+but don't be sad! The solution is to copy your `build/resources/main/*` into
+`build/classes/java/main` before launching the game or you may link those two
+ together:
+
+```shell script
+$ rm -r build/resources/main && ln -s ../classes/java/main build/resources/main
+```