Adds dark theme support to the OM documentation

Applies a dark theme to the documentation site using the `darkly` theme.
Provides a visually appealing dark mode option.
Configures colors to ensure readability and aesthetic consistency.

docs/index.md

@@ -1,17 +1,68 @@
-# Welcome to MkDocs
+# Installation
 
-For full documentation visit [mkdocs.org](https://www.mkdocs.org).
+## <img width="28px" src="https://vcpkg.io/assets/mark/mark.svg" /> Using vcpkg
+**Note**: Support vcpkg for package management
+1. Install [vcpkg](https://github.com/microsoft/vcpkg)
+2. Run the following command to install the orange-math package:
+```
+vcpkg install orange-math
+```
+CMakeLists.txt
+```cmake
+find_package(omath CONFIG REQUIRED)
+target_link_libraries(main PRIVATE omath::omath)
+```
+For detailed commands on installing different versions and more information, please refer to Microsoft's [official instructions](https://learn.microsoft.com/en-us/vcpkg/get_started/overview).
 
-## Commands
+## <img width="28px" src="https://xmake.io/assets/img/logo.svg" /> Using xrepo
+**Note**: Support xrepo for package management
+1. Install [xmake](https://xmake.io/)
+2. Run the following command to install the omath package:
+```
+xrepo install omath
+```
+xmake.lua
+```xmake
+add_requires("omath")
+target("...")
+    add_packages("omath")
+```
 
-* `mkdocs new [dir-name]` - Create a new project.
-* `mkdocs serve` - Start the live-reloading docs server.
-* `mkdocs build` - Build the documentation site.
-* `mkdocs -h` - Print help message and exit.
+## <img width="28px" src="https://upload.wikimedia.org/wikipedia/commons/e/ef/CMake_logo.svg?" /> Build from source using CMake
+1. **Preparation**
 
-## Project layout
+   Install needed tools: cmake, clang, git, msvc (windows only).
 
-    mkdocs.yml    # The configuration file.
-    docs/
-        index.md  # The documentation homepage.
-        ...       # Other markdown pages, images and other files.
+    1. **Linux:**
+        ```bash
+        sudo pacman -Sy cmake ninja clang git
+        ```
+    2. **MacOS:**
+        ```bash
+        brew install llvm git cmake ninja
+        ```
+    3. **Windows:**
+
+       Install Visual Studio from [here](https://visualstudio.microsoft.com/downloads/) and Git from [here](https://git-scm.com/downloads).
+
+       Use x64 Native Tools shell to execute needed commands down below.
+2. **Clone the repository:**
+   ```bash
+   git clone https://github.com/orange-cpp/omath.git
+   ```
+3. **Navigate to the project directory:**
+   ```bash
+   cd omath
+   ```
+4. **Build the project using CMake:**
+   ```bash
+   cmake --preset windows-release -S .
+   cmake --build cmake-build/build/windows-release --target omath -j 6
+   ```
+   Use **\<platform\>-\<build configuration\>** preset to build suitable version for yourself. Like **windows-release** or **linux-release**.
+
+   | Platform Name | Build Config  |
+       |---------------|---------------|
+   | windows       | release/debug |
+   | linux         | release/debug |
+   | darwin        | release/debug |