Improve README (#17)

* Add helper tag

* Fix source reference

* Add icons

* Update code-server README

* Update README for contributing

* Update README

* Improve readme

* Fix code-server without extensions

jfrog/README.md

@@ -1,7 +1,7 @@
 ---
 display_name: JFrog
 description: Install the JF CLI and authenticate with Artifactory
-icon: ../icons/jfrog.svg
+icon: ../.icons/jfrog.svg
 maintainer_github: coder
 partner_github: jfrog
 verified: true