Install step specification

docs/install.md

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+# File installing
+
+## Install steps
+
+### move
+```move [location]``` \
+move is simplest install step of all. It just moves the selected file to 
+the given location.
+
+### extract
+```extract [location]``` \
+extract can be used with zip files, to extract the contents of the zip file
+to the given location.
+
+### rename
+```rename [new name]``` \
+rename renames the selected file to the new given filename.
+
+### execute
+```execute [location] [arguments]```
+execute can be used with an executable jar file. The jar file will be executed with the given arguments and 
+the given location as working directory. A client should inform the user before just executing the file and
+ask him for permission to do so and/or it should execute the jar in a closed environment, like a container,
+to prevent viruses from being installed.
+
+### select
+```select [filename]```
+select is used to select the file with the given file name for other installation steps.
+The file name can also be a relative path, if the file is not directly in the Minecraft directory.
+If no file name is given, the selection resets to the original file itself, also if it was already moved to another location.
+
+## Locations
+
+Locations are specified as a relative path from the Minecraft directory. For example `./mods` 
+would point to the mods directory of the Minecraft instance, to which the file should be installed.
+
+## Directories
+
+If the selected file is a directory, then it is treated like a zip file, which means, that you can move and
+rename it like normal files, but also use the `extract` install step, to move all contents of the directory
+to the specified location.