Update ReadME.md File

Author: zeyadetman

README.md

@@ -3,12 +3,12 @@ Computer Security algorithms in C#
 
 ## List of Algorithms
 - [ ] AutokeyVigenere.
-- [ ] Ceaser.
-- [ ] Columnar.
-- [ ] HillCipher.
-- [ ] Monoalphabetic.
-- [ ] PlayFair.cs
-- [ ] RailFence
-- [ ] RepeatingKeyVigenere
+- [x] Ceaser.
+- [x] Columnar.
+- [x] HillCipher.
+- [x] Monoalphabetic.
+- [x] PlayFair.cs
+- [x] RailFence
+- [x] RepeatingKeyVigenere
 
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