Add Debugging chapter and detail our just helping tools (#57)

Author: tvami

src/SUMMARY.md

@@ -47,6 +47,7 @@
   - [Unit Testing](developing/Unit-Testing-in-ldmx-sw.md)
 - [Logging](developing/Logging.md)
 - [Creating a new Event Bus Object](developing/Creating-a-new-Event-Bus-Object.md)
+- [Debugging](developing/Debugging.md)
 - [Creating your own production image](developing/custom-production-image.md)
 - [What the F.A.Q.?](developing/faq.md)
 - [Why this workflow?](developing/whyyyy.md)

src/developing/Debugging.md

@@ -0,0 +1,23 @@
+# Debugging
+
+CMAKE provides several useful flags for debugging and code analysis. We've included many of these in `just` recipes for convenience.
+
+## Commands to use:
+
+### Static Analysis
+  - **`configure-clang-tidy`** - Enables clang-tidy static analysis during compilation to catch potential bugs and style issues before runtime. The CMAKE flag is `-DENABLE_CLANG_TIDY=ON`. This will slow down compilation but provides valuable feedback on code quality.
+
+### Optimization
+  - **`configure-clang-lto`** - Switches to the clang/clang++ compiler and enables LTO (Link Time Optimization), which can improve performance by optimizing across compilation units during linking. The flags are `-DENABLE_LTO=ON -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang`. Note: LTO significantly increases link time but may catch additional optimization-related issues.
+
+### Runtime Sanitizers
+  - **`configure-asan-ubsan`** - Enables both ASAN (AddressSanitizer) and UBSAN (UndefinedBehaviorSanitizer) to detect memory errors (buffer overflows, use-after-free, etc.) and undefined behavior at runtime. The flags are `-DENABLE_SANITIZER_UNDEFINED_BEHAVIOR=ON -DENABLE_SANITIZER_ADDRESS=ON`. 
+    - **Important:** These sanitizers only detect issues when the problematic code is actually executed.
+    - If issues are detected, the program will abort and print detailed diagnostic information.
+
+### Interactive Debugging
+  - **`configure-gdb`** - Compiles with debug symbols preserved and optimizations disabled, enabling effective debugging with GDB (GNU Debugger). The flag is `-DCMAKE_BUILD_TYPE=Debug`. This allows you to:
+    - Set breakpoints and step through code line-by-line
+    - Inspect variable values during execution
+    - View readable stack traces
+    - Note: Debug builds are significantly slower than release builds due to disabled optimizations.