added features summary link to README.md

Author: silverqx

README.md

@@ -39,6 +39,7 @@ Whole library is documented as markdown documents:
   - [TinyORM](/docs/building/tinyorm.mdx#building-tinyorm)
   - [Hello world](/docs/building/hello-world.mdx#building-hello-world)
   - [Migrations](/docs/building/migrations.mdx#building-migrations)
+- [Features Summary](/docs/features-summary.mdx#features-summary)
 
 ### Features Summary