Add base64 encode and decode

Base64-Encode-Decode/README.md

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+# Base64 Encode And Decode
+## Usage
+``` bash
+usage: Base64 [-h] [-d | --decode | --no-decode] text
+
+Base64 encode adn decode string
+
+positional arguments:
+  text                  The text to decode or encode
+
+options:
+  -h, --help            show this help message and exit
+  -d, --decode, --no-decode
+                        Decode text (default: False)
+```
+
+## Example
+### Encode
+```
+python3 base64_encode_decode.py "abcxyz 123"
+```
+Result:
+```
+YWJjeHl6IDEyMw==
+```
+
+### Decode: 
+```
+python3 base64_encode_decode.py -d YWJjeHl6IDEyMw==
+```
+Result: 
+```
+abcxyz 123
+```

Base64-Encode-Decode/base64_encode_decode.py

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+import base64
+from argparse import ArgumentParser, BooleanOptionalAction
+
+
+def decode(encoded: str) -> str:
+    return base64.b64decode(encoded).decode()
+
+
+def encode(text: str) -> str:
+    return base64.b64encode(text.encode()).decode()
+
+
+if __name__ == "__main__":
+    parser = ArgumentParser(
+        prog="Base64",
+        description="Base64 encode adn decode string",
+    )
+    parser.add_argument("-d", "--decode", action=BooleanOptionalAction, default=False, type=bool, help="Decode text")
+    parser.add_argument("text", type=str, help="The text to decode or encode")
+    args = parser.parse_args()
+    if args.decode:
+        print(decode(args.text))
+    else:
+        print(encode(args.text))