Added gold sponsor to BACKERS.md

Author: ivaylokenov

BACKERS.md

@@ -1 +1,31 @@
 # Sponsors & Backers
+
+**MyTested.AspNetCore.Mvc** is a community-driven open source project. It's an independent project with its ongoing development made possible thanks to the support by these awesome [backers](https://github.com/ivaylokenov/MyTested.AspNetCore.Mvc/blob/development/BACKERS.md). If you'd like to join them, please consider:
+
+- [Become a backer or sponsor on Patreon](https://www.patreon.com/ivaylokenov)
+- [Become a backer or sponsor on OpenCollective](https://opencollective.com/mytestedaspnet)
+- [One-time donation via PayPal](http://paypal.me/ivaylokenov)
+- [One-time donation via Buy my a coffee](http://buymeacoff.ee/ivaylokenov)
+- One-time donation via crypto-currencies:
+  - BTC (Bitcoin) - 3P49XMiGXxqR2Dq1HdqHpkCa6UD848rpBU 
+  - BCH (Bitcoin Cash) - qqgyjlvmuydf6gtfhfdypyw2u8utmc3uqg4nwma3y4
+  - ETC (Ethereum) - 0x2bc55e4b1B9b296B751738631CD24b2f701E588F
+  - LTC (Litecoin) - MQ1GJum1QuqAuUsc6LarE3Z6TQQJ3rJwsA
+
+#### What's the difference between Patreon and OpenCollective?
+
+Funds donated via both platforms are used for development and marketing purposes. Funds donated via OpenCollective are managed with transparent expenses. Your name/logo will receive proper recognition and exposure by donating on either platform.
+
+## Gold Sponsors
+
+<table>
+  <tbody>
+    <tr>
+      <td align="center" valign="middle">
+        <a href="https://softuni.org/" target="_blank">
+          <img width="148px" src="https://softuni.org/platform/assets/icons/logo.svg">
+        </a>
+      </td>
+    </tr>
+  </tbody>
+</table>