Housekeeping - documentation update.

Introduced a new dependency checking script that validates required apt packages before building the project

Documented the expanded package list and instructions for running the script within the build prerequisites documentation

Updated build system instructions to call the dependency checker prior to configuring with CMake

docs/BuildPrerequisites.md

@@ -21,13 +21,21 @@ Run the following commands to install dependent libraries required by the PiPeda
  
     sudo apt update 
     sudo apt upgrade
+	
     sudo apt install -y liblilv-dev libboost-dev  \
         libsystemd-dev catch libasound2-dev uuid-dev \
         authbind libavahi-client-dev  libnm-dev libicu-dev \
         libsdbus-c++-dev libzip-dev google-perftools \
         libgoogle-perftools-dev \
-        libpipewire-0.3-dev 
-    
+        libpipewire-0.3-dev libwebsocketpp-dev libsdl2-dev
+
+After installing these packages, run the dependency checker to verify that
+everything required is present:
+
+```bash
+cd ~/src/pipedal
+./scripts/check_deps.sh
+```    
 
 ### Installing Sources
 

docs/TheBuildSystem.md

@@ -13,7 +13,9 @@ available through the Code plugins store) has configured itself, build commands
 If you are not using Visual Studio Code, you can configure, build and install PiPedal using CMake build tools. For your convenience,
 the following shell scripts have been provided in the root of the project.
 
-    ./init.sh   # Configure the CMake build for the first time, or if you 
+    ./scripts/check_deps.sh   # Verify required system packages
+
+    ./init.sh   # Configure the CMake build for the first time, or if you
               # have changed one of the CMakeList.txt files. (release build)
 
     ./mk.sh   # Build all targets (release build)