Add a feature to search from markdown files from a test directory

testdata/nvalt.md

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+# nvALT
+
+## What it is
+
+Notational Velocity is a way to take notes quickly and effortlessly using just your keyboard. You press a shortcut to bring up the window and just start typing. It will begin searching existing notes, filtering them as you type. You can use ⌘-J and ⌘-K to move through the list. Enter selects and begins editing. If you’re creating a new note, you just type a unique title and press enter to move the cursor into a blank edit area. Check out the descriptions at notational.net for a more eloquent synopsis.
+
+## Notational Velocity Features
+
+- Option for horizontal layout with multi-line previews in notes list
+- Words between [[double-brackets]] will become links to other notes
+- Tags are synced to Dropbox and searched by Spotlight, via OpenMeta
+- Tags are auto-completed while typing in the tag-entry field
+- TaskPaper-compatible strikethrough formatting using the “@done” tag
+- Fully plain-text-based automatic list-bullet formatting
+- Note-titles inside double-brackets are (optionally) auto-completed
+- “Show in Finder” command for revealing selected note-files on disk
+- Highlighting of search terms can be disabled
+- Dragging the divider to the top or left of the window will hide search field
+- and more http://notational.net/releasenotes/release2/
+- Open in external text editor
+
+## nvALT Additional Features