Feature/2 ignore folders (#42)

* Updated README

* #2 - using Obsidian's "Excluded files" setting to downrank results

* #2 - using the correct api

src/types.d.ts

@@ -0,0 +1,7 @@
+import { type MetadataCache } from 'obsidian'
+
+declare module 'obsidian' {
+  interface MetadataCache {
+    isUserIgnored(path:string):boolean
+  }
+}