Include FTB instructions

minecraft/java/ftb/README.md

@@ -1,6 +1,26 @@
-# Feed The Beast Modpacks
+## FTB Packs
+[FTB Modpacks](https://api.modpacks.ch)
+A generic service to pull FTB modpacks from api.modpacks.ch.
+There are 2 ways to install a server through this service.
+The first method only requires you to know the modpacks name and version.
+The second method requires you to know the id for both the modpack and version in the api.
 
-Allows you to download official feed the beast modpacks.
+**Method 1 (Recommended)**
+- FTB_SEARCH_TERM: the modpack name to query for, must be at least 4 characters long.
+  EX: for FTB: Interactions you would do "interactions".
+- FTB_VERSION_STRING: the string version that you want to install.
+  EX: for FTB: Interactions 2.0.2, you would put "2.0.2".
+  
+**Method 2**
+- FTB_MODPACK_ID: the id that directs to the modpack in the api.
+  EX: for FTB: Interactions the id would be "5". https://api.modpacks.ch/public/modpack/5
+- FTB_MODPACK_VERSION_ID: the version id in the api.
+  EX: for FTB: Interactions 2.0.2 the id is "86". https://api.modpacks.ch/public/modpack/5/86
+
+**NOTE**
+**Not all FTB packs come with a server.properties file, due to this the server.properties file
+may not get updated with the correct ip address and port at first launch.
+Please restart the server after first launch to fix this.**  
 
 ## Server Ports
 The minecraft server requires a single port for access (default 25565) but some plugins may require extra ports to enabled for the server.
@@ -8,4 +28,5 @@ The minecraft server requires a single port for access (default 25565) but some
 
 | Port  | default |
 |-------|---------|
-| Game  | 25565   |
+| Game  | 25565   |
+