Add Elliptic Curve and docs

docs/example-rsa-keys.md

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+# Generating RSA Keys
+In the following section, we are going to see how to generate RSA Keys and how to encrypt data with these keys.
+
+```
+#!/usr/bin/env python3
+
+from Cryptotools.Encryptions.RSA import RSA
+
+
+rsa = RSA()
+rsa.generateKeys(size=512)
+
+e = rsa.e
+d = rsa.d
+n = rsa.n
+
+s = "I am encrypted with RSA"
+print(f"plaintext: {s}")
+encrypted = rsa.encrypt(s)
+
+# Encrypt data
+print(f"ciphertext: {encrypted}")
+
+# We decrypt
+plaintext = rsa.decrypt(encrypted)
+print(f"Plaintext: {plaintext}")
+```