docs...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

README.md

@@ -2,19 +2,41 @@
 
 LaTeX class for making photo books.
 
-<!-- XXX Requirements... -->
 
-To build the documentation (`photobook.pdf`) use:
+## Build requirements
 
+- LaTeX tool chain (including: `lualatex`, `latexmk`, ..)  
+  The simplest way to get started is [TeX Live](https://www.tug.org/texlive/), 
+  either a full install or for specific modules see the _Packages_ section 
+  in [photobook.cls](./photobook.cls),
+- U\*ix-like environment (`bash`, GNU Make, coreutils, ...),  
+  on Windows systems either [Cygwin](https://www.cygwin.com/) or 
+  [WSL/WSL2](https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux) 
+  should work fine.
+
+
+## Build / Install
+
+```shell
+# get the source...
+$ git clone https://github.com/flynx/photobook.git
+
+# if desired, install in the user context...
+$ cd ./photobook
+$ make install
+```
+
+If only building the docs is required without installing:
 ```shell
 $ make doc 
 ```
 
-To install to the user context:
-
-```shell
-$ make install
-```
-
-
 For more info on `make` targets see the: [./Makefile](./Makefile)
+
+
+<!-- 
+XXX ToDo:
+- manual
+- workflow
+-->
+