add metacallcli README

Author: akshgpt7

source/cli/metacallcli/README.md

@@ -0,0 +1,13 @@
+# MetaCall CLI
+
+## Currently Available Commands
+
+**Use the `help` command to see the usage of a particular command.**
+
+- `load`: Load a script from file into MetaCall
+- `inspect`: Show all runtimes, modules and functions (with their signature) loaded into MetaCall
+- `call`: Call a function previously loaded in MetaCall (Note: For `js` and `py` functions that do not return anything, the default return value is a `null`)
+- `await`: Await an async function previously loaded in MetaCall
+- `clear`: Delete a script previously loaded in MetaCall
+- `exit`: Exit from MetaCall CLI
+- `help`: Show help for MetaCall CLI