Added instructions

.gitignore

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 src/main/resources/translations_backup/
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 TEMP
+data

build_instructions.md

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+# Build a jar
+
+```shell
+mvn package
+```
+
+# Build executable using Launch4j
+- Install Java on Windows
+- Run Launch4j (download first) and create executable
+- Copy jre from computer to jre folder that should be in the same folder as list.exe 

instructions.md

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+# Instructions
+
+Instructions on how to run list.
+
+## Windows
+
+There are two options. 
+
+### Run list.exe
+The easier option is to download list.zip, extract it and run list.exe.
+
+### Run list.jar
+To do this you first need to install the correct version of java (JDK). The program was developed and tested on [JDK Development Kit 21.0.2](https://www.oracle.com/java/technologies/downloads/#java21).
+If you already have another version of Java installed you might have to delete previous version before you install this version.
+
+Secondly, you may run list using `run.bat` which will run `list.jar` for you.
+
+## Linux
+### Run list.jar
+Similarly to running list.jar in Windows, you have to first make sure, that you have the appropriate version of Java installed. The program was developed and tested on [JDK Development Kit 21.0.2](https://www.oracle.com/java/technologies/downloads/#java21).
+If you already have another version of Java installed you might have to delete previous version before you install this version.
+
+Next, you may run list using `run.sh` which will run `list.jar` for you.
+