add CLI Usage to README (#9)

Author: izelnakri

README.md

@@ -2,10 +2,28 @@
 
 Live @ https://deno-visualizer.danopia.net
 
-## `/dependencies-of/`
-
 This tool shows a Graphviz rendering of high-level module dependencies.
 
+## CLI Usage
+
+```sh
+$ deno install -f -n deno-graph --allow-run=deno,dot https://raw.githubusercontent.com/cloudydeno/module-visualizer/main/feat/dependencies-of/cli.ts
+✅ Successfully installed deno-graph
+
+$ deno-graph https://deno.land/x/[email protected]/mod.ts
+digraph "imported modules" {
+  rankdir="TB";
+
+  "https://deno.land/x/[email protected]"[shape="box",label="/x/[email protected]\l4 files, 9 KB\l",penwidth="1.6931471805599454",fontname="Arial",style="filled",tooltip="https://deno.land/x/[email protected]",fillcolor="lightskyblue",href="https://deno.land/x/[email protected]"];
+  "https://deno.land/x/[email protected]" -> "https://deno.land/[email protected]";
+
+  "https://deno.land/[email protected]"[shape="box",label="/[email protected]\l    • /encoding\l2 files, 3 KB\l",penwidth="1",fontname="Arial",style="filled",tooltip="https://deno.land/[email protected]",fillcolor="lightgreen",href="https://deno.land/[email protected]"];
+
+}
+```
+
+## `/dependencies-of/`
+
 The implementation was initially represented by this shell pipeline:
 
 ```sh