feat: add pwhash

pwhash/src/main.rs

@@ -0,0 +1,11 @@
+use pwhash::bcrypt;
+
+fn main() {
+    // Hash a password with default parameters.
+    let h_new = bcrypt::hash("password").unwrap();
+
+    // Verify a password against an existing hash.
+    let h = "$2y$05$bvIG6Nmid91Mu9RcmmWZfO\
+         5HJIMCT8riNW0hEp8f6/FuA2/mHZFpe";
+    assert!(bcrypt::verify("password", h));
+}