shacl-engine performance and experimental features

- redos #39
- closes rdf-ext/shacl-engine#44

@bergos please check it out

Author: VladimirAlexiev

README.md

@@ -38,8 +38,8 @@ Software tools or libraries, sorted by programming language.
   - [playground](https://shacl.org/playground/) - Browser-based testbed.
 - [rdf-validate-shacl](https://github.com/zazuko/rdf-validate-shacl) <img alt="NPM Version" src="https://img.shields.io/npm/v/rdf-validate-shacl" align="top"> <img alt="GitHub Release Date" src="https://img.shields.io/github/release-date/zazuko/rdf-validate-shacl" align="top"> - Supports SHACL Core; pure JavaScript validator on top of the [RDFJS](https://rdf.js.org/) stack; `MIT` license; `JavaScript`.
   - [playground](https://zazuko.github.io/shacl-playground) - Browser-based testbed.
-- [shacl-engine](https://github.com/rdf-ext/shacl-engine) <img alt="NPM Version" src="https://img.shields.io/npm/v/shacl-engine" align="top"> <img alt="GitHub last commit" src="https://img.shields.io/github/last-commit/rdf-ext/shacl-engine" align="top"> - Supports SHACL Core, SHACL-SPARQL; A fast engine for data provided as [RDF/JS](http://rdf.js.org/data-model-spec/) objects; `MIT` license; `JavaScript`.
-  - [playground](https://playground.rdf-ext.org/shacl/) - Browser-based testbed.
+- [shacl-engine](https://github.com/rdf-ext/shacl-engine) <img alt="NPM Version" src="https://img.shields.io/npm/v/shacl-engine" align="top"> <img alt="GitHub last commit" src="https://img.shields.io/github/last-commit/rdf-ext/shacl-engine" align="top"> - Supports SHACL Core, SHACL-SPARQL, Experimental [SHACL 1.2](https://www.w3.org/TR/shacl12-core/) support ([shacl-engine experimental](https://github.com/rdf-ext/shacl-engine/tree/experimental)); 15-26x faster than other JavaScript or Python packages ([blog post](https://www.bergnet.org/2023/03/2023/shacl-engine/), [real-world examples](https://github.com/rdf-ext/shacl-engine/issues/12#issuecomment-1940875628)); works on data provided as [RDF/JS](http://rdf.js.org/data-model-spec/) objects; `MIT` license; `JavaScript`.
+  - [playground](https://playground.rdf-ext.org/shacl/) and [playground experimental](https://playground.rdf-ext.org/shacl-experimental/) - Browser-based testbed.
   - [rdf-ext-cli](https://github.com/rdf-ext/rdf-ext-cli) - Command line tool for validation. Data and shapes can be given as file, URL, or SPARQL endpoint + query.
 - [SHACL for Ruby](https://github.com/ruby-rdf/shacl) <img alt="Gem Version" src="https://img.shields.io/gem/v/shacl" align="top"> <img alt="GitHub last commit" src="https://img.shields.io/github/last-commit/ruby-rdf/shacl" align="top"> - A pure-Ruby library for working with the Shape Constraint Language to validate the shape of RDF graphs; `BSD-3-Clause` license; `Ruby`.
 - [maplib](https://github.com/DataTreehouse/maplib) <img src="https://img.shields.io/github/v/tag/DataTreehouse/maplib" align="top"> <img src="https://img.shields.io/github/last-commit/DataTreehouse/maplib" align="top"> - High-performance RDF knowledge graph construction, SHACL validation and SPARQL-based enrichment. `Apache-2.0` license. `Rust` with `Python` bindings. But SHACL is not open source: [lib/shacl/src/lib.rs](https://github.com/DataTreehouse/maplib/blob/main/lib/shacl/src/lib.rs) says `unimplemented!("Contact Data Treehouse to try")` 💰.