Update and rename readme.txt to readme.md

Author: il3ven

readme.md

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+# [Code Dump](https://codedump.xyz/)
+
+> A modern pastebin alternative to share code fast. Made using React, MongoDb, Express.js and Highlight.js.
+
+### Screenshot
+![image](https://user-images.githubusercontent.com/4337699/130579319-52d3a954-fcaa-4c8e-acac-1e3eb9a69b42.png)
+
+## How to use
+1. Copy the code you want to share
+2. Visit [https://codedump.xyz](https://codedump.xyz)
+3. Press `Ctrl + V` or `Cmd + V`
+4. Copy the generated link. Example link - [https://codedump.xyz/py/YSSngLN_1bylw7xP](https://codedump.xyz/py/YSSngLN_1bylw7xP)
+
+### More advanced features
+1. Visit `https://codedump.xyz/` + `fileExtension` to change the selected language.
+
+For example, visiting `https://codedump.xyz/py` will make the selected language as Python.
+
+2. To change the syntax highlighting rename the URL.
+
+Changing `https://codedump.xyz/py/YSSngLN_1bylw7xP` to `https://codedump.xyz/js/YSSngLN_1bylw7xP` will make JavaScript as the langauge.