Installation.md

+## Installation
+In order to install the package you need the package *remotes*.
+
+```R
+install.packages("remotes")
+```
+
+To install the *TreeMig* package from this repository you can use this code:
+```R
+remotes::install_gitlab(repo = "boehmd/TreeMig@master", subdir = "Wrapper/TreeMig_Package",
+                    host="https://gitlab.wsl.ch/", auth_token = "13Nh_3Y7Hg_zuPBJHRiw", force=TRUE, upgrade = "never")
+```
+
+(on realease the repository will be public (GitHub?) so no creds are needed)
+
+## TreeMig Environment
+After installing the package, you can create a TreeMig environment with the following command:
+```R 
+TreeMig::createTMEnvironment(path, name)
+```
+This will create a new directory at *path/name* with all the necessary files to run TreeMig.
+Inside this folder you will find a file named **ExampleScript.R**. This is the main script which you can use as a template.
+
+### Folder Structure
+The TreeMig directory contains the following folders:
+
+| Folder| Desc | 
+| ------ | ------ | 
+| C | control files are located here, if you load any control file with cfg$loadConfig() the file should be in this folder |
+| E | [bioclimate](Input-Data#bioclimate) and [stock](Input-Data#stock-data) input data |
+| P | tree parameter file |
+| R | simulation results |
+
+| Files | Desc |
+| ------ | ------ |
+| listOfCtrlPars.txt | defines the control file name and the OS for TreeMig |
+| statefile.txt | input for TreeMig, see [statefile](statefile) for more information |
+| TM.exe/TM_Mac.app | this is the TreeMig executable that will run TreeMig |
+
+For now you don't have to worry about these files. The R-Package will modify the files needed for your simulation and put them into the corresponding folders.
+
+
+
+For additional information/examples see the [wiki-page](home)
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