Added message encoder-decoder

Tech stack py

scripts/Message Encoder and Decoder/README.md

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+# Message Encoder and Decoder
+
+A web application used to encrypt and decrypt text messages. 
+- For the encodings listed in RFC 4648, it offers encoding and decoding functions.
+
+## Tech Stack 🛠
+![Python](https://img.shields.io/badge/Python-3.9-yellowgreen)
+![Streamlit](https://img.shields.io/badge/Streamlit-0.85.1-red)
+![base64](https://img.shields.io/badge/-base64-lightgrey)
+
+## Features ⚡
+
+- Encoding and Decoding using Private Key
+- Neat and Clean UI
+
+## Demo 👀
+
+[streamlit-app-encode-decode.webm](https://user-images.githubusercontent.com/81156510/183291295-e759eb45-0c1c-4d4e-9f5a-e2f3f95f8a72.webm)
+
+<hr>

scripts/Message Encoder and Decoder/app.py

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+import streamlit as st
+import base64
+
+# Function to Encode
+
+def Encode(key, message):
+    enc=[]
+    for i in range(len(message)):
+        key_c = key[i % len(key)]
+        enc.append(chr((ord(message[i]) + ord(key_c)) % 256))
+        
+    return base64.urlsafe_b64encode("".join(enc).encode()).decode()
+
+
+# Function to decode
+
+def Decode(key, message):
+    dec=[]
+    message = base64.urlsafe_b64decode(message).decode()
+    for i in range(len(message)):
+        key_c = key[i % len(key)]
+        dec.append(chr((256 + ord(message[i])- ord(key_c)) % 256))
+        
+    return "".join(dec)
+
+message = st.text_input('Message Text')
+
+key = st.text_input(
+    "Private key", type="password"
+)
+
+mode = st.selectbox(
+    "What action would you like to perform?",
+    ("Encode", "Decode")
+)
+
+if st.button('Result'):
+    if (mode == "Encode"):
+        # Encode(key, message)
+        st.write(Encode(key, message))
+    else:
+        st.write(Decode(key, message))
+else:
+    st.write('Please enter all the required information!!')
+