docs: Update CMake instructions

Author: krippner

README.md

@@ -42,7 +42,7 @@ For more information, see the [Python bindings repository](https://github.com/kr
 - **Clean and flexible** code base
   - Warning-free even on high warning levels such as `-Wall`, `-Wextra`, `-pedantic`
   - Follows [SOLID](https://en.wikipedia.org/wiki/SOLID) design principles
-  - Extensive unit tests
+  - Extensive [unit tests](#building-the-unit-tests)
   - Linted with [Clang-Tidy](https://clang.llvm.org/extra/clang-tidy/)
 
 For a complete guide, please see the [documentation](docs/index.md#top).
@@ -147,10 +147,10 @@ Steps to compile and run the example:
 
 ## Using it with CMake
 
-If you are using CMake, you can use the `FetchContent` module to download and include the library in your project.
-Here is an example of how to use AutoDiff in a CMake project:
+### Including it in your project with CMake
 
-### Project files
+If you are using CMake, you can use the `FetchContent` module to download and include the library in your project.
+Here is an example of how to use AutoDiff in a CMake project.
 
 Create a `CMakeLists.txt` file:
 
@@ -184,23 +184,35 @@ int main()
     std::cout << "y(1.0) = " << y() << '\n';
     AutoDiff::Function f(y);
     f.pushTangentAt(x);
-    std::cout << "dy/dx = " << d(y) << '\n';
+    std::cout << "df/dx = " << d(y) << '\n';
 }
 ```
 
+Build the project:
+
+```bash
+mkdir build && cd build
+cmake .. -DFETCHCONTENT_UPDATES_DISCONNECTED=ON
+cmake --build .
+```
+
+This will download the repository into your build folder and build the project.
+Use the setting `FETCHCONTENT_UPDATES_DISCONNECTED=ON` to avoid downloading the repository every time you configure your project.
+
 ### Building the unit tests
 
-Configure CMake for GCC/Clang:
+Make sure you have `Catch2` (v3) and `Eigen` (v3.4) installed.
+
+Download the repository and configure CMake/Clang:
 
 ```bash
-cmake --preset tests-ninja-linux-release -DFETCHCONTENT_UPDATES_DISCONNECTED=ON
+git clone https://github.com/krippner/auto-diff.git
+cd auto-diff
+cmake --preset tests-ninja-linux-release
 ```
 
 For Visual Studio, you can use the `tests-msvc2022` preset.
 
-This will download the repository into your build folder.
-Use the setting `FETCHCONTENT_UPDATES_DISCONNECTED=ON` to avoid downloading the repository every time you configure your project.
-
 Build and run:
 
 ```bash
@@ -211,7 +223,7 @@ ctest
 
 ## Using it with Conan
 
-### Installation
+### Installation with Conan
 
 Download the repository and install the library to your Conan cache:
 
@@ -223,7 +235,7 @@ conan create . --build=missing
 
 This will also build and run the unit tests, unless your Conan configuration `tools.build:skip_test` is set to `True`.
 
-### Including it in your project
+### Including it in your project with Conan
 
 Add the following line to your `conanfile.txt`: