Update readme

README.md

@@ -1,9 +1,13 @@
 # Supersingular Isogeny Key Encapsulation
 
-Repository keeps simple Go's implementation of 
-SIKE based on field p434 and p503 (Round2).
+``go-sike`` is a Golang implementation of (SIKE)[http://sike.org] - isogeny-based key encryption mechanism. SIKE is a candidate for (standarization)[https://csrc.nist.gov/Projects/Post-Quantum-Cryptography] by NIST as quantum-safe key exchange algorithm.
 
-## Speed
+## Implementation
+
+This code guarantees correctness of implementation and portability. It is fully compatible with version 3.2 of an algorithm. Implementation currently contains 2 finite fields ``p434`` and ``p503``.
+
+
+## Speed - for reference
 
 ### P503