Add basic multipler example

multiplier/Cargo.toml

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+[package]
+name = "multiplier"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

multiplier/README.md

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+# Multiplier example
+
+Example wrapper around a basic Circom circuit to test Circom 2 integration
+through ark-circom and FFI.

multiplier/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}