feat(script): add script for fetching dependencies from https://github.com/leanprover/emacs-dependencies.git

script/fetch_emacs_deps.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Script for copying the Lean Emacs mode dependencies from https://github.com/leanprover/emacs-dependencies.git.
+# We usually use it to test `leanemacs` without installing Lean.
+# We execute this script at src/emacs.
+read -p "Script will delete directory 'dependencies' and create it again with the content of https://github.com/leanprover/emacs-dependencies.git, Are you sure [y/n]? " -n 1 -r
+echo    # (optional) move to a new line
+if [[ ! $REPLY =~ ^[Yy]$ ]]
+then
+    echo "ABORTED."
+    exit 1
+fi
+rm -r -f dependencies
+git clone https://github.com/leanprover/emacs-dependencies.git
+rm -r -f emacs-dependencies/.git
+mv emacs-dependencies dependencies