feat(doc): include bao test framework introduction

source/development/testing.rst

@@ -1,6 +1,24 @@
 Testing
 =======
-
+The primary goal of the Bao Test Framework is to provide the infrastructure for the testing process
+of Bao Project components. It encompasses three core components: (i) a C library designed for
+real-time test handling, (ii) a build system based on Nix, and (iii) a Python Tool for
+comprehensive test management.
+
+1. **C Library** - This library provides a framework for writing tests. It defines (i) a run-time
+   that automates the invocation of function unit tests and (ii) an API that mainly provides a way
+   of outputting test results in a standard format that can be parsed by the Python Tool (see
+   below).
+
+2. **Nix Build System** - The Nix Build System introduces an abstraction layer for system builds,
+   facilitating a modular construction of the target software stack used for testing. It
+   encompasses a series of nix recipes that allow the compilation and build of three distinct
+   layers: (i) the hypervisor, (ii) multiple guests (e.g., baremetal, freeRTOS, etc.), and (iii)
+   the firmware.
+
+3. **Python Tool** - A command line tool that drives the framework by managing both the Nix Build
+   System and the C code library components to build testing artifacts, automating their deployment
+   in the target platform, and gathering, analyzing and outputting the final results.
 
 Test Framework Overview
 -----------------------

source/spelling_wordlist.txt

@@ -67,3 +67,5 @@ subdirectory
 scalability
 codebase
 unix
+baremetal
+freeRTOS