Add Emacs interface to semantic-search directly to main repository

Too much overhead to maintain multiple repositories, especially when
the Emacs library for semantic-search is a single file.

Import Readme from the emacs-semantic-search repository too

interface/emacs/README.org

@@ -0,0 +1,44 @@
+* Emacs Semantic Search
+  /An Emacs interface for [[https://github.com/debanjum/semantic-search][semantic-search]]/
+
+** Requirements
+   - Install and Run [[https://github.com/debanjum/semantic-search][semantic-search]]
+
+** Installation
+   - Direct Install
+     - Put ~semantic-search.el~ in your Emacs load path. For e.g ~/.emacs.d/lisp
+
+     - Load via ~use-package~ in your ~/.emacs.d/init.el or .emacs file by adding below snippet
+       #+begin_src elisp
+         ;; Org-Semantic Search Library
+         (use-package semantic-search
+           :load-path "~/.emacs.d/lisp/semantic-search.el"
+           :bind ("C-c s" . 'semantic-search))
+       #+end_src
+
+   - Use [[https://github.com/quelpa/quelpa#installation][Quelpa]]
+     - Ensure [[https://github.com/quelpa/quelpa#installation][Quelpa]], [[https://github.com/quelpa/quelpa-use-package#installation][quelpa-use-package]] are installed
+     - Add below snippet to your ~/.emacs.d/init.el or .emacs config file and execute it.
+       #+begin_src elisp
+         ;; Org-Semantic Search Library
+         (use-package semantic-search
+           :quelpa (semantic-search :fetcher url :url "https://raw.githubusercontent.com/debanjum/semantic-search/master/interface/emacs/semantic-search.el")
+           :bind ("C-c s" . 'semantic-search))
+       #+end_src
+
+** Usage
+   1. Call ~semantic-search~ using keybinding ~C-c s~ or ~M-x semantic-search~
+
+   2. Enter Query in Natural Language
+
+      e.g "What is the meaning of life?" "What are my life goals?"
+
+   3. Wait for results
+
+      *Note: It takes about 15s on a Mac M1 and a ~100K lines corpus of org-mode files*
+
+   4. (Optional) Narrow down results further
+
+      Include/Exclude specific words from results by adding to query
+
+      e.g "What is the meaning of life? -god +none"