Start work on an installer

docs/installer.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+#
+# installer.sh
+# Copyright (C) 2018 Kovid Goyal <kovid at kovidgoyal.net>
+#
+# Distributed under terms of the GPLv3 license.
+#
+
+python=$(command -v python3)
+if [ -z "$python" ]; then
+    python=$(command -v python2)
+fi
+if [ -z "$python" ]; then
+    python=$(command -v python2.7)
+fi
+if [ -z "$python" ]; then
+    python=$(command -v python)
+fi
+if [ -z "$python" ]; then
+    python=python
+fi
+
+echo Using python executable: $python
+
+$python -c "import sys; script_launch=lambda:sys.exit('Download of installer failed!'); exec(sys.stdin.read()); script_launch()" "$@" <<'INSTALLER_HEREDOC'
+# {{{
+# HEREDOC_START
+# HEREDOC_END
+# }}}
+INSTALLER_HEREDOC