Merge pull request w3c-cg#26 from w3c-cg/intellij-plugin

feat(IDE support): added RDF and SPARL IntelliJ plugin

Author: VladimirAlexiev

README.md

@@ -108,6 +108,7 @@ Data viewers/Editors based on shapes.
 - [SHACL Language Server](https://marketplace.visualstudio.com/items?itemName=stardog-union.vscode-langserver-shacl) - A VS Code extension providing language intelligence (diagnostics, hover tooltips, auto-completion, etc.) for W3C standard SHACL via the Language Server Protocol.
 - [Mentor RDF for VS Code](https://marketplace.visualstudio.com/items?itemName=faubulous.mentor) - Code editing support for RDF, RDFS, OWL, SKOS, SHACL and SPARQL.
 - [SHACLC Language Server](https://marketplace.visualstudio.com/items?itemName=jeswr.shaclc-language-server) ([source](https://github.com/jeswr/shaclc-language-server)) - A VS Code extension providing language intelligence (diagnostics, hover tooltips, auto-completion, etc.) for CG standard SHACL Compact Syntax via the Language Server Protocol. MIT License.
+- [RDF and SPARQL](https://rdfandsparql.com/) - IntelliJ plugin with editor support for ShEx Compact syntax and SHACL validation.
 
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