Add DevToysMac (#1142)

* Add DevToysMac

* Add icons for DevToysMac

README.md

@@ -879,6 +879,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 * [AirServer](http://www.airserver.com/Download) - Most advanced screen mirroring software receiver for Mac, PC and Xbox One.
 * [Cloudflare WARP](https://1.1.1.1/) - Replaces the connection between your device and the Internet with a modern, optimized, protocol. ![Freeware][Freeware Icon]
 * [DNS Heaven](https://github.com/greenboxal/dns-heaven) - Unifies macOS DNS so applications using glibc can resolve DNS with the native stack. Mainly for use with VPNs. [![Open-Source Software][OSS Icon]](https://github.com/greenboxal/dns-heaven) ![Freeware][Freeware Icon]
+* [DevToysMac](https://github.com/ObuchiYuki/DevToysMac) - Offline toolbox that helps developers in daily tasks. ![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]
 * [DevUtils.app](https://devutils.com/) - All-in-one Toolbox for Developers. Format/Validate JSON, encode/decode Base64, convert timestamps, debug JWT… with just one click! Native macOS app and works offline. [![Open-Source Software][OSS Icon]](https://github.com/DevUtilsApp/DevUtils-app) ![Freeware][Freeware Icon] [![App Store][app-store Icon]](https://apps.apple.com/us/app/devutils-app/id1533756032)
 * [Etcher](https://www.balena.io/etcher/) - Flash OS images to SD cards & USB drives, safely and easily. [![Open-Source Software][OSS Icon]](https://github.com/balena-io/etcher) ![Freeware][Freeware Icon]
 * [Google Assistant (Unofficial Desktop Client)](https://github.com/Melvin-Abraham/Google-Assistant-Unofficial-Desktop-Client) - A cross-platform desktop client for Google Assistant based on Google Assistant SDK. ![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]