added connect to metamask video

docs/videos/connect_to_metamask.md

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+# Connect to Evmos Testnet using MetaMask
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/bFQuYjwvt8s" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
+
+This video is created as part of EvmosNation grant project (organized by Encode Club) by Lalith Medury, an independent content creator.
+
+In this video, we will learn the following:
+
+-   Creating a React app
+-   Integrating Web3.js library to the React app
+-   Using Web3.js library to connect to Metamask wallet
+-   Load addresses from Metamask wallet
+-   Switch accounts in Metamask wallet