initial implemetation of Sumcheck protocol (#7)

pcs/Cargo.toml

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

pcs/readme.md

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+KZG based multilinear polynomial commitment
+-----
+

pcs/src/lib.rs

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+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        let result = 2 + 2;
+        assert_eq!(result, 4);
+    }
+}