add page with guide to install mcap with cmake (#1190)

### Changelog Add a page to `website` with the guide on how to install MCAP with Cmake. ### Description This follows conversation from https://foxglove.slack.com/archives/C02H1JXG3C3/p1719462475680899 --------- Co-authored-by: Devon Rueckner <indirectlylit@users.noreply.github.com>
foxglove · Jul 16, 2024 · 05505c7 · 05505c7
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diff --git a/cpp/README.md b/cpp/README.md
@@ -86,9 +86,18 @@ following dependencies:
 If your project does not need `lz4` or `zstd` support, you can optionally disable these by defining
 `MCAP_COMPRESSION_NO_LZ4` or `MCAP_COMPRESSION_NO_ZSTD` respectively.
 
+### Conan
+
 To simplify installation of dependencies, the [Conan](https://conan.io/) package
 manager can be used with the included
 [conanfile.py](https://github.com/foxglove/mcap/blob/main/cpp/mcap/conanfile.py).
+
+### CMake
+
+For using MCAP with CMake, the third-party [olympus-robotics/mcap_builder](https://github.com/olympus-robotics/mcap_builder) repository provides a helpful wrapper.
+
+### Alternatives
+
 If you use an alternative approach, such as CMake's FetchContent or directly
 vendoring the dependencies, make sure you use versions equal or greater than the
 versions listed above.

diff --git a/website/docs/guides/cpp/cmake.md b/website/docs/guides/cpp/cmake.md
@@ -0,0 +1,9 @@
+---
+description: Build and use MCAP C++ library with CMake.
+---
+
+# Build MCAP with CMake
+
+If you want to add MCAP to your C++ project that uses CMake, the third-party [olympus-robotics/mcap_builder](https://github.com/olympus-robotics/mcap_builder) repository provides a helpful wrapper.
+
+The readme file in that repository provides the steps and the context needed.