Increase the size of a few heading labels

README.md

@@ -5,7 +5,7 @@
 libheif-sharp provides .NET bindings for [libheif](https://github.com/strukturag/libheif).   
 It is built against [.NET Standard 2.0](https://docs.microsoft.com/en-us/dotnet/standard/net-standard), and should work on any supported .NET platform that has a libheif shared library.
 
-### Features
+## Features
 
 * Supports decoding
     * Top-level images
@@ -17,16 +17,16 @@ It is built against [.NET Standard 2.0](https://docs.microsoft.com/en-us/dotnet/
     *  Thumbnails
 * Supports reading and writing meta-data
 
-### Documentation
+## Documentation
 
 [API Documentation](https://0xc0000054.github.io/libheif-sharp/API/index.html)   
 [Building libheif on Windows with vcpkg](https://0xc0000054.github.io/libheif-sharp/libheif_windows_build_vcpkg.html)
 
-### Sample Applications
+## Sample Applications
 
 The [libheif-sharp-samples](https://github.com/0xC0000054/libheif-sharp-samples) repository contains sample applications that demonstrate the use of the library.
 
-### Requirements
+## Requirements
 
 The libheif shared library must be named `libheif` in order for it to be found by P/Invoke.   
 On some platforms a [DllImportResolver](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.nativelibrary.setdllimportresolver) can be used to customize the loading of the `libheif` native library.