Added README

README.md

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+# GAPAPFixer
+
+Small utility to fix inigmatus' Contract Pack: Giving Aircraft a Purpose not recognizing blackheart612's 
+Airplane Plus crew cabins. 
+
+I do not hold any rights of the aforementioned, amazing KSP Addons:
+
+ * [GAP by inigmatus](https://github.com/inigmatus/GAP)
+ * [Airplane 
+Plus](https://forum.kerbalspaceprogram.com/index.php?/topic/140262-14x-144-airplane-plus-r230-full-1875m-parts-crj-series-new-jet-engine-fixes-jul-20-2018/)
+
+## Reason
+
+I recently got GAP and was totally stunned by the amount of fun it adds to KSP aviation.
+What I especially liked, was its stock vibe. Nevertheless, I felt kind of limited with
+the stock parts, thus I installed Airplane Plus, with which I'm now building a lot of 
+planes. Sadly, GAP and AP didn't go along, hence this small utility.
+
+## Requirements
+
+As this is written in kotlin, a JRE (Java Runitme Enviornment) is required.
+It was tested with a JRE 1.8.
+
+## Usage
+
+This is a gradle / kotlin project, which could be built like so:
+
+```
+./gradlew build
+```
+
+The resulting JAR is located in `build/libs/` folder.
+
+If there are any releases, then go ahead an use the pre-built releas by calling:
+
+```
+java -jar GAPAPFixer-<version>.jar [<GameDataPath>]
+```
+
+Without the optional `<GameDataPath>`, the path to your KSP's `GameData` folder,
+the GAPAPFixer will look for the files, assuming KSP at it's default-steam location.
+See [the wiki page](https://wiki.kerbalspaceprogram.com/wiki/Root_directory#GameData) if you don't know what 
+this is.
+
+This utility is unforgiving: It will not create any backups of the files it patches.
+
+## Effects
+
+The utility adds the necessary contract parameters to the contracts 'Flight 102' and 'Flight 103'.
+
+It modifies, _patches_, the files `/Contaract Packs/GAP/Flights/Flights/Airline-Flight-X.cfg` (where `X` is 
+`102` and `103`).
+
+
+## Contribution
+
+Go ham! This utility is nothing special and licensed under MIT (see LICENSE file).
+
+Please follow the Google Java Style Guide!
+
+## Roadmap
+
+Ultimately, this utility will be config-file based, for know it is hardcoded only for Airplane Plus.
+