docs: Add Gitter badge (#12)

gitter-badger · web-flow · commit 7fc766b39a3e · 2021-10-27T21:41:11.000+03:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Java Design Patterns Website [![Netlify Status](https://api.netlify.com/api/v1/badges/d1c6a8ba-ed86-40e0-a204-943bba15e9cc/deploy-status)](https://app.netlify.com/sites/jdp-vue/deploys)
+# Java Design Patterns Website [![Netlify Status](https://api.netlify.com/api/v1/badges/d1c6a8ba-ed86-40e0-a204-943bba15e9cc/deploy-status)](https://app.netlify.com/sites/jdp-vue/deploys) [![Join the chat at https://gitter.im/iluwatar/java-design-patterns-vuepress-web](https://badges.gitter.im/iluwatar/java-design-patterns-vuepress-web.svg)](https://gitter.im/iluwatar/java-design-patterns-vuepress-web?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 <a href="https://www.netlify.com">
   <img src="https://www.netlify.com/img/global/badges/netlify-color-accent.svg" alt="Deploys by Netlify" />

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Java Design Patterns Website [![Netlify Status](https://api.netlify.com/api/v1/badges/d1c6a8ba-ed86-40e0-a204-943bba15e9cc/deploy-status)](https://app.netlify.com/sites/jdp-vue/deploys)`
	`1`	`+# Java Design Patterns Website [![Netlify Status](https://api.netlify.com/api/v1/badges/d1c6a8ba-ed86-40e0-a204-943bba15e9cc/deploy-status)](https://app.netlify.com/sites/jdp-vue/deploys) [![Join the chat at https://gitter.im/iluwatar/java-design-patterns-vuepress-web](https://badges.gitter.im/iluwatar/java-design-patterns-vuepress-web.svg)](https://gitter.im/iluwatar/java-design-patterns-vuepress-web?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)`
`2`	`2`
`3`	`3`	`<a href="https://www.netlify.com">`
`4`	`4`	`<img src="https://www.netlify.com/img/global/badges/netlify-color-accent.svg" alt="Deploys by Netlify" />`