Create Obsidian plugin for Khoj

- Features
  - Search using Khoj from within the Obsidian app
    Allow Natural language search on your (markdown) notes in Obsidian Vault

  - Show search results as rendered (instead of raw) Markdown
    Improve legibility of the results

  - Jump to selected note from search result in Khoj search modal
    Simplify seeing result within its original note context

  - Automatically configure khoj to index markdown files in current vault
    Reduce khoj setup steps for plugin users by using reasonable defaults

    - Code updates the markdown config in khoj.yml and triggers index update
    - It can be configured by user in khoj plugin settings, if required

  - Add Demo and detailed Readme for the Obsidian plugin
    Ease setup and usage. Give context about capabilities

- Miscellaneous
  - Trying keep a mono repo until the Khoj project is mature enough
    to reduce maintainance burden

src/interface/obsidian/manifest.json

@@ -0,0 +1,10 @@
+{
+    "id": "khoj",
+    "name": "Khoj",
+    "version": "0.2.1",
+    "minAppVersion": "0.15.0",
+    "description": "Natural, Incremental Search for your Second Brain 🦅",
+    "author": "Debanjum Singh Solanky",
+    "authorUrl": "https://github.com/debanjum",
+    "isDesktopOnly": false
+}