Create hashnode.md

docs/hosted-at/hashnode.md

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+When you create your Hashnode blog, hashnode provides a free **yourdomain.hashnode.dev** subdomain for you. However, you can set up your own **yourdomain.tld** domain or **blog.yourdomain.tld** subdomain to your Hashnode blog.
+
+In this guide, you will learn how to accomplish this alongside some additional specific guides for different domain DNS providers.
+
+---
+
+1. Log in to your Hashnode account.
+
+2. Click on your **profile picture** at the bottom-left corner of the page on *desktop* screen or top-right corner on *mobile* screen.
+
+![Hashnode's Feed](https://cdn.hashnode.com/res/hashnode/image/upload/v1614932849541/cBNDGKXMj.png?auto=compress)
+
+3. Click on the **Blog Dashboard** option from the popup modal to access your blog's dashboard.
+
+![Hashnode's Feed](https://cdn.hashnode.com/res/hashnode/image/upload/v1614937218081/InvxVHXDy.png?auto=compress)
+
+4. Navigate to the **DOMAIN** tab and enter your domain without the **www** or **https://** prefix in the text field provided. Then click on the **Update** button to proceed.
+
+![Hashnode's Blog Domain Tab](https://cdn.hashnode.com/res/hashnode/image/upload/v1614937377176/0cwddAywO.png?auto=compress)
+
+5. Go To Your Fork Of The `is-a-dev/register` repo, edit your subdomain's JSON file, make sure you remove any old records, then add this:
+```json
+"CNAME": "hashnode.network"
+```
+
+Once Done, your hashnode blog is setup to use your subdomin, all you have to do is wait sometime for the DNS to propogate. These changes could take from 1 hour to around 48 hours, so please be patient, It'll most likely be ready within a hour.
+Enjoy Your Hashnode Blog, With Your Sweet `.is-a.dev` Subdomain!