Update repl_setup.md

Author: yaelmhoffman

docs/start/smrepl/repl_setup.md

@@ -2,3 +2,14 @@
 id: setup
 title: SMRepl Setup
 ---
+
+## Overview
+
+SMRepl is a basic reference Spacemesh wallet and a full node manager command line REPL.
+
+Smrepl is designed to work together with a locally running go-spacemesh full node or with the public Spacemesh API.
+
+Target users are developers who want to hack on the Spacemesh platform and Spacemesh devnet or testnet users who are comfortable with terminal apps and REPLs.
+
+
+## Install SMRepl