Add initial draft for "getting started"

book.toml

@@ -3,3 +3,6 @@ authors = []
 language = "en"
 multilingual = false
 src = "src"
+title = "Styx Book"
+
+[preprocessor.alerts]

src/2_getting_started.md

@@ -1 +1,42 @@
 # Getting started
+
+> [!NOTE]  
+> This book uses Styx wrappers from the NiWrap package, but any Styx wrapper will work the same way.
+
+To get started install the [NiWrap](https://github.com/childmindresearch/niwrap/tree/main) Python package:
+
+```sh
+pip install -e "git+https://github.com/childmindresearch/niwrap.git/#egg=niwrap&subdirectory=python"
+```
+
+From there on running commands will be as easy as:
+
+```Python
+from niwrap import fsl
+
+bet_output = fsl.bet(
+    infile="my_file.nii.gz",
+    binary_mask=True,
+)
+```
+
+This runs the command
+
+```sh
+bet my_file.nii.gz -m
+```
+
+and stores all the output files for easy access in `bet_output`.
+
+These can then be used as an input to another Styx wrapper or with any other Python package like nilearn:
+
+```Python
+from nilearn.plotting import plot_anat
+
+plot_anat(bet_output.outfile)
+```
+
+> [!TIP]  
+> Styx includes detailed documentation about every command, argument, and output file. You should be able to just hover over any of them in your editor to view its documentation.
+
+The next chapter will explain how to use _Runners_ to control how the commands get executed and intermediate files get stored. 

src/SUMMARY.md

@@ -2,7 +2,6 @@
 
 - [The Styx Book](./1_welcome.md)
 - [Getting started](./2_getting_started.md)
-    - [Installation](./2a_installation.md)
     - [Runners](./2b_runners.md)
     - [Tips & best practices](./2c_tips_best_practices.md)
     - [Contributing to NiWrap](./2d_contributing_to_niwrap.md)