Firsts-steps.md

+![image](.wiki-images/header.png)
+
+## Install the required software
+
+1.1 First of all, Python is required. Therefore, either:
+    
+- ensure your Python3 is up to date
+
+- we recommend installing [Anaconda](Anaconda Tricks) that will allow you creating an independent environment with the wished Python version
+
+1.2 Install `git` and `git lfs` after reading the [Git Tricks page](Git Tricks) and following the given installation procedure.
+
+## Collect the current version of bio2mslib 
+
+2.1 Clone the bio2mslib following the [Git Tricks page](Git Tricks) instructions. The main git commands can be found in [Git Commands page](Git Commands).
+
+2.2 To be sure that everything is in order run a `git pull` and a `git lfs pull`.
+
+2.3 To link bio2mslib with your Python environment:
+
+- on Windows: open environment variables (right click on "this PC" --> properties --> advanced system settings --> environment variables)
+
+   - add new environment variable called PYTHONPATH
+
+   - specify the library path above bio2mslib (example: C://users/X/research/ if your library is in C://users/X/research)
+
+![firsts-steps](.wiki-images/firsts-steps.jpg)
+
+- on Linux and MacOS: 
+    - in your `home` edit the `.bashrc` or `.profile` to add the path to the `bio2mslib` folder such as:
+`export PYTHONPATH=/path_to_bio2mslib:$PYTHONPATH`
+    - then reload 'the chosen file `source` by running in a terminal: `source ~/.bashrc` or  `source ~/.profile`
+    - finally check if the path is well registered in python by running in a python terminal: `import sys` then `sys.path` amongst the proposed paths you should find the one introduced earlier.
+
+2.4 Run `test_install.py` each time you get `ModuleNotFoundError` check the missing module and install it. For more explanations on how to install module read [How to install module](https://gitlab.univ-lorraine.fr/baldit1/bio2mslib/-/wikis/Python-and-Anaconda-Tricks#how-to-install-a-package-or-module)