channel add

Code/ldpc/src/channel.rs

@@ -0,0 +1,14 @@
+pub rand::Rng;
+
+pub struct Channel {
+    pub error_prob: f64,
+}
+
+impl Channel {
+    pub fn new(error_prob: f64) -> Self {
+        assert!(error_prob >= 0.0 && error_prob <= 1.0, "0 <= p <= 1");
+        Self {error_prob}
+    }
+
+}
+