Finished README

README.md

@@ -6,10 +6,41 @@ The ***Vigenere cipher*** was named after **Blaise de Vigenère**. This **substi
 
 ## Detailed Explanations : How it works?
 
-1. Firstly, 
+#### 1. Firstly, we'll "draw" the Vigenere Table:
+<img align="center" width="500" src="https://upload.wikimedia.org/wikipedia/commons/9/9a/Vigenère_square_shading.svg"/>
 
+#### 2. After, we'll repeat the key:
+If our message has a length of 12 for example, and our key is `CRYPTOOLS`, then we just repeat it until the new key length is superior to the message length:
+
+```
+CRYPTOOLSCRYPTOOLS
+```
+And we take the first `x` characters of this string, where `x` is our message length:
+```
+CRYPTOOLSCRY
+```
+
+#### 3. We encrypt the message using the Vigenere Table:
+```
+CRYPTOGRAPHY
+     |
+     v
+CRYPTOOLSCRY
+------------
+EIWEMCUCSRYW
+```
+#### 4. We output the word
+```
+return "EIWEMCUCSRYW"
+```
 ## Weaknesses
+- Repeating key
+- Cryptanalysis can determine the key length
 
-## Example
+## Implementations
 
-### Encrypting
+| **Language** | Encrypt                        | Decrypt                        |
+| ------------ | ------------------------------ | ------------------------------ |
+| C            | [c/vigenere.c](c/vigenere.c)   | [c/vigenere.c](c/vigenere.c)   |
+| Python       | [py/encrypt.py](py/encrypt.py) | [py/decrypt.py](py/decrypt.py) |
+| JavaScript   | [js/encrypt.js](js/encrypt.js) | [js/decrypt.js](js/decrypt.js) |