update README

README.md

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-# nix_virtualenvs
-
-This is a repository for different virtual environments, which can be used with the **Nix** package manager.
-
-Just copy the content of the desired folder to your project, add your required packages to the `*.txt` file and run `nix-shell`.

README.org

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+* nix_virtualenvs
+
+  This is a set of various virtual environments which can be used with the *Nix* package manager.
+
+  Copy the =shell.nix= file from the desired folder into your project and run ~nix-shell~.
+  This will drop you into a virtual environment with all requirements fulfilled.
+  Please check below how the virtual environments work and how to add environment specific packages.
+ 
+  If you need more Nix packages in your environent, enhance the list ~buildInputs~ in the file =shell.nix=.
+
+** node_environment
+
+   1. Create a directory =.npm=
+   2. If the file =global_packages.txt= is present, install the packages via *npm* globally in the =.npm= directory
+   3. Run ~npm install~ if a file =package.json= is present
+   4. Add the =.npm= directory to the ~$PATH~ variable
+
+** python_environment
+
+   1. Create a new python virtualenv in the folder =.venv=
+   2. Source the virtual environment
+   3. Upgrade pip to the latest version
+   4. If present, install the packages from the file =requirements.txt= via pip