Merge pull request #2322 from moreal/devforum-badge

Add devforum badge to README

README.md

@@ -3,6 +3,8 @@ Lib9c - A library for Nine Chronicles
 
 [![Planetarium Discord Invite](https://img.shields.io/discord/539405872346955788?color=6278DA&label=Planetarium&logo=discord&logoColor=white)](https://discord.gg/JyujU8E4SD)
 [![Planetarium-Dev Discord Invite](https://img.shields.io/discord/928926944937013338?color=6278DA&label=Planetarium-dev&logo=discord&logoColor=white)](https://discord.gg/RYJDyFRYY7)
+[![Discourse posts](https://img.shields.io/discourse/posts?server=https%3A%2F%2Fdevforum.nine-chronicles.com%2F&logo=discourse&label=9c-devforum&color=00D1C2
+)](https://devforum.nine-chronicles.com)
 
 Lib9c is a library that contains key implementations of [Nine Chronicles](https://nine-chronicles.com), a decentralized RPG developed with [Libplanet](https://libplanet.io).
 Lib9c includes Nine Chronicle's key features like in-game decisions and data models, which can be used to implement game core capabilities.