Added Encryption and Decryption script

Author: ThatSINEWAVE

File Encryption and Decryption/README.md

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+<div align="center">
+
+# File Encryption and Decryption
+
+</div>
+
+### Description:
+This Python script encrypts and decrypts a file using a simple Caesar cipher.
+
+### How to Use:
+1. Run the script in a Python environment.
+2. Choose option '1' to encrypt a file or '2' to decrypt a file.
+3. Enter the path to the input file.
+4. Enter the path to save the output file.
+5. Enter the encryption/decryption key (shift value).
+6. The script will perform the encryption/decryption and save the result in the specified output file.

File Encryption and Decryption/encryptor-decryptor.py

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+def caesar_cipher(text, shift, decrypt=False):
+    if decrypt:
+        shift = -shift
+    encrypted_text = ""
+    for char in text:
+        if char.isalpha():
+            shifted = ord(char) + shift
+            if char.islower():
+                if shifted > ord('z'):
+                    shifted -= 26
+                elif shifted < ord('a'):
+                    shifted += 26
+            elif char.isupper():
+                if shifted > ord('Z'):
+                    shifted -= 26
+                elif shifted < ord('A'):
+                    shifted += 26
+            encrypted_text += chr(shifted)
+        else:
+            encrypted_text += char
+    return encrypted_text
+
+
+def encrypt_file(input_file, output_file, key):
+    with open(input_file, 'r') as f:
+        plaintext = f.read()
+    encrypted_text = caesar_cipher(plaintext, key)
+    with open(output_file, 'w') as f:
+        f.write(encrypted_text)
+
+
+def decrypt_file(input_file, output_file, key):
+    with open(input_file, 'r') as f:
+        ciphertext = f.read()
+    decrypted_text = caesar_cipher(ciphertext, key, decrypt=True)
+    with open(output_file, 'w') as f:
+        f.write(decrypted_text)
+
+
+def main():
+    choice = input("Enter '1' to encrypt a file or '2' to decrypt a file: ")
+    if choice == '1':
+        input_file = input("Enter the path to the file to encrypt: ")
+        output_file = input("Enter the path to save the encrypted file: ")
+        key = int(input("Enter the encryption key (shift value): "))
+        encrypt_file(input_file, output_file, key)
+        print("File encrypted successfully.")
+    elif choice == '2':
+        input_file = input("Enter the path to the file to decrypt: ")
+        output_file = input("Enter the path to save the decrypted file: ")
+        key = int(input("Enter the decryption key (shift value): "))
+        decrypt_file(input_file, output_file, key)
+        print("File decrypted successfully.")
+    else:
+        print("Invalid choice!")
+
+
+if __name__ == "__main__":
+    main()