docs: add feature to readme!

Author: danielroe

README.md

@@ -35,6 +35,7 @@ The aim of [npmx.dev](https://npmx.dev) is to provide a better browser for the n
 - **Install size** – total install size including dependencies
 - **Playground links** – quick access to StackBlitz, CodeSandbox, and other demo environments from READMEs
 - **Infinite search** – auto-load additional search pages as you scroll
+- **Keyboard navigation** – press `/` to focus search, arrow keys to navigate results, Enter to select
 - **Claim new packages** – register new package names directly from search results (via local connector)
 
 ### User & org pages
@@ -65,6 +66,7 @@ The aim of [npmx.dev](https://npmx.dev) is to provide a better browser for the n
 | Vulnerability warnings         |    ✅     |    ✅    |
 | Download charts                |    ✅     |    ✅    |
 | Playground links               |    ❌     |    ✅    |
+| Keyboard navigation            |    ❌     |    ✅    |
 | Dependents list                |    ✅     |    🚧    |
 | Package admin (access/owners)  |    ✅     |    🚧    |
 | Org/team management            |    ✅     |    🚧    |