Add SBOM generation guide

docs/guides/sbom.md

@@ -0,0 +1,39 @@
+Crow has the ability to generate a SBOM (Software Bill of Materials) at build using [`cmake-sbom`](https://github.com/DEMCON/cmake-sbom) in SPDX format.
+
+## Prerequisites
+
+The CMake module `cmake-sbom` expects the `spdx-tools`, `reuse`, and `ntia-conformance-checker` Python packages as external prerequisites. 
+
+## Example Steps
+
+Below you'll find the steps to add SBOM generation. 
+
+### Install Python Packages
+
+Create a Python virtual environment first so you're not installing Python packages globally:
+
+1. Create and navigate to the build directory:<br> `mkdir build && cd build`
+2. Create the venv:<br> `python3 -m venv .venv`
+3. Activate the venv (macOS/Linux):<br> `source .venv/bin/activate`
+4. Install the required Python packages:<br> `pip install spdx-tools reuse ntia-conformance-checker`
+
+### Build Crow with cmake-sbom
+
+Steps to generate a `.spdx` file using CMake for your project:
+
+1. If you didn't create the `build` directory, create and navigate to the build directory:<br> `mkdir build && cd build`
+2. Enable the build option:<br> `cmake .. -DCROW_GENERATE_SBOM=ON -DPython3_EXECUTABLE=$(which python3)`
+3. Then run:<br> `cmake --build .`
+4. Run the install:<br> `cmake --install . --prefix /tmp/crow-install`
+
+Check for the generated .spdx file in the `build/` directory. The file name follows this pattern:<br> `crow-<version>-<date>.spdx`
+
+!!! note
+    You must pass `-DPython3_EXECUTABLE=$(which python3)` so CMake uses the venv's Python instead of the system Python. Without it,
+    the SBOM verification step will fail because the system Python won't have the required packages installed. 
+
+!!! note
+    The .spdx file is generated when you run the `cmake --install . --prefix /tmp/crow-install`
+
+!!! note
+    You can also combine `-DCROW_GENERATE_SBOM=ON` with conditional dependencies:<br> `cmake .. -DCROW_GENERATE_SBOM=ON -DCROW_ENABLE_SSL=ON -DCROW_ENABLE_COMPRESSION=ON`

mkdocs.yml

@@ -67,6 +67,7 @@ nav:
       - Multipart: guides/multipart.md
       - Query Strings: guides/query-string.md
       - Middleware: guides/middleware.md
+      - SBOM Generation: guides/sbom.md
       - SSL: guides/ssl.md
       - Static Files: guides/static.md
       - Blueprints: guides/blueprints.md