Add ZincSearch to search engines (#3059)

* added ZincSearch search engine

* added zinc playground server

README.md

@@ -1608,6 +1608,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 - [Typesense](https://typesense.org) - Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use. ([Source Code](https://github.com/typesense/typesense)) `GPL-3.0` `C++`
 - [Whoogle](https://github.com/benbusby/whoogle-search) `⚠` - A self-hosted, ad-free, privacy-respecting metasearch engine. `MIT` `Python`
 - [Yacy](https://yacy.net/en/index.html) - Peer based, decentralized search engine server. ([Demo](https://search.yacy.net/), [Source Code](https://github.com/yacy/yacy_search_server)) `GPL-2.0` `Java`
+- [ZincSearch](https://zincsearch.com) - A lightweight alternative to elasticsearch that requires minimal resources, written in Go. ([Demo](https://github.com/zinclabs/zinc#playground-server), [Source Code](https://github.com/zinclabs/zinc)) `Apache 2.0` `Go`
 
 
 ### Self-hosting Solutions