Update README.md

README.md

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 PlayVk is a single header file library for simplifying vulkan objects creation, initializing vulkan, and rendering basic geometries. <br><br>
 
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+
+## Documentation
+
+### Functions
+* **pvkCreateVulkanInstanceWithExtensions**: Creates VkInstance instance
+  * Param 1 (integer): is the number of extensions we require
+  * Param 2 (variadic): is a variadic argument consisting of list of `const char*` strings representing the extensions required.
+```C
+VkInstance instance = pvkCreateVulkanInstanceWithExtensions(2, "VK_KHR_win32_surface", "VK_KHR_surface");
+````
+
+* **pvkWindowCreate**: Creates Win32 Window
+  * Param 1 (integer): width of the window
+  * Param 2 (integer): height of the window
+  * Param 3 (const char*): Name of the window (which is displayed in the title bar)
+  * Param 4 (bool): whether the window need to be created in full screen mode
+  * Param 5 (bool): whether the window should be resizable
+```C
+PvkWindow* window = pvkWindowCreate(800, 800, "Vulkan Multipass Rendering", false, true);
+```
+
+* **pvkWindowCreateVulkanSurface**: Creates Vulkan surface (VkSurfaceKHR)
+  * Param 1 (PvkWindow*): pointer to PvkWindow object, created with `pvkWindowCreate` function
+  * Param 2 (VkInstance): vulkan instance object
+```C
+VkInstance instance = ...
+PvkWindow* window = ...
+VkSurfaceKHR surface = pvkWindowCreateVulkanSurface(window, instance);
+```