feat: implement first task as file

src/tasks/tasks01/poly2block.rs

@@ -0,0 +1,7 @@
+use crate::utils::poly::{self, coefficient_to_binary};
+use base64::prelude::*;
+use serde_json::Value;
+
+pub fn poly2block(coefficients: Vec<u8>) -> String {
+    BASE64_STANDARD.encode(poly::coefficient_to_binary(coefficients).to_ne_bytes())
+}