Update Emacs Usage section in Readme. Add find-similar, menu usage

src/interface/emacs/README.org

@@ -10,6 +10,10 @@
      - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#1-Setup-Backend][Setup Backend]]
      - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#2-Install-Khojel][Install Khoj.el]]
    - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Use][Use]]
+     - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Search][Search]]
+     - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Find-similar-entries][Find Similar Entries]]
+     - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Advanced-usage][Advanced Usage]]
+     - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Khoj-menu][Khoj Menu]]
    - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Upgrade][Upgrade]]
      - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Upgrade-Khoj-Backend][Upgrade Backend]]
      - [[https://github.com/debanjum/khoj/tree/master/src/interface/emacs#Upgrade-Khojel][Upgrade Khoj.el]]
@@ -59,20 +63,42 @@
      #+end_src
 
 ** Use
-   1. Open Query Interface on Client
+*** Search
+  1. Hit ~C-c s s~ (or ~M-x khoj RET s~) to open khoj search
 
-       - In Emacs: Call ~khoj~ using keybinding ~C-c s~ or ~M-x khoj~
-       - On Web: Open http://localhost:8000/
+  2. Enter your query in natural language
 
-   2. Query Incrementally in Natural Language
+    e.g "What is the meaning of life?", "My life goals for 2023"
 
-      e.g "What is the meaning of life?" "What are my life goals?"
+*** Find Similar Entries
+  This feature finds entries similar to the one you are currently on.
+  1. Move cursor to the org-mode entry, markdown section or text paragraph you want to find similar entries for
+  2. Hit ~C-c s f~ (or ~M-x khoj RET f~) to find similar entries
 
-   3. Apply filters to narrow down results further. See [[https://github.com/debanjum/khoj/#query-filters][query filters]] for details
+*** Advanced Usage
+  - Add [[https://github.com/debanjum/khoj/#query-filters][query filters]] during search to narrow down results further
 
-      Include/Exclude specific words or date range from results by updating query with below query format
+    e.g `What is the meaning of life? -"god" +"none" dt>"last week"`
 
-      e.g `What is the meaning of life? -"god" +"none" dt>"last week"`
+  - Use ~C-c C-o 2~ to open the current result at cursor in its source org file
+
+    - This calls ~M-x org-open-at-point~ on the current entry and opens the second link in the entry.
+    - The second link is the entries [[https://orgmode.org/manual/Handling-Links.html#FOOT28][org-id]], if set, or the heading text.
+      The first link is the line number of the entry in the source file. This link is less robust to file changes.
+    - Note: If you have [[https://orgmode.org/manual/Speed-Keys.html][speed keys]] enabled, ~o 2~ will also work
+
+*** Khoj Menu
+  [[/docs/khoj_emacs_menu.png]]
+  Hit ~C-c s~ (or ~M-x khoj~) to open the khoj menu above. Then:
+  - Hit ~t~ until you preferred content type is selected in the khoj menu
+
+    ~Content Type~ specifies the content to perform ~Search~, ~Update~ or ~Find Similar~ actions on
+  - Hit ~n~ twice and then enter number of results you want to see
+
+    ~Results Count~ is used by the ~Search~ and ~Find Similar~ actions
+  - Hit ~-f u~ to ~force~ update the khoj content index
+
+    The ~Force Update~ switch is only used by the ~Update~ action
 
 ** Upgrade
 *** Upgrade Khoj Backend