Readme, License Fixes and another test added

circuits/sha256/rotate.circom

@@ -0,0 +1,10 @@
+
+
+template RotR(n, r) {
+    signal input in[n];
+    signal output out[n];
+
+    for (i=0; i<n; i++) {
+        out[i] <== in[ (i+r)%n ];
+    }
+}