Add missing meta descriptions (#116)

* Add missing meta descriptions

* Update source/testing.txt

* Update source/thread-safety.txt

---------

Co-authored-by: Rachel Mackintosh <[email protected]>

Author: nlarew

source/api-abi-versioning.txt

@@ -4,6 +4,9 @@
 API and ABI Versioning
 ======================
 
+.. meta::
+   :description: Understand the API and ABI versioning for the C++ driver, including header file structure, library filenames, and the use of CMake package config files.
+
 .. contents:: On this page
    :local:
    :backlinks: none

source/api-abi-versioning/abi-versioning.txt

@@ -4,6 +4,9 @@
 ABI Versioning
 ===============
 
+.. meta::
+   :description: Understand how the C++ Driver uses ABI versioning to manage stability and compatibility for shared libraries, including the use of ABI namespaces and versioning policies.
+
 .. contents:: On this page
    :local:
    :backlinks: none

source/api-abi-versioning/api-versioning.txt

@@ -4,6 +4,9 @@
 API Versioning
 ===============
 
+.. meta::
+   :description: Understand how the C++ Driver uses Semantic Versioning for API versioning, distinguishing between public and private APIs, and handling deprecations.
+
 .. contents:: On this page
    :local:
    :backlinks: none

source/index.txt

@@ -2,6 +2,9 @@
 MongoDB C++ Driver
 ===================
 
+.. meta::
+   :description: Explore the MongoDB C++ Driver, including installation, connection setup, data operations, and advanced configuration options.
+
 .. facet::
    :name: genre
    :values: reference

source/testing.txt

@@ -4,6 +4,9 @@
 Testing
 =======
 
+.. meta::
+   :description: Learn how to run and write tests for the C++ driver using Catch, including unit and integration tests.
+
 .. contents:: On this page
    :local:
    :backlinks: none

source/thread-safety.txt

@@ -4,6 +4,9 @@
 Thread and Fork Safety
 =======================
 
+.. meta::
+   :description: Ensure each thread has its own mongocxx::client and avoid sharing client objects across threads to maintain thread safety in C++ MongoDB applications.
+
 .. contents:: On this page
    :local:
    :backlinks: none