Add javascript target README.md

Author: surister

cratedb_sqlparse_js/README.md

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+# Cratedb sqlparse - javascript edition.
+
+![NPM License](https://img.shields.io/npm/l/cratedb-sqlparse?style=for-the-badge)
+![NPM Version](https://img.shields.io/npm/v/cratedb-sqlparse?style=for-the-badge)
+![NPM Unpacked Size](https://img.shields.io/npm/unpacked-size/cratedb-sqlparse?style=for-the-badge)
+![NPM Type Definitions](https://img.shields.io/npm/types/cratedb-sqlparse?style=for-the-badge)
+
+CrateDB sqlparser for javascript, compiled from antlr4 Javascript compile target.
+
+### Simple usage
+```javascript
+import { sqlparse } from cratedb-sqlparse;
+
+const query = `
+SELECT * FROM SYS.SHARDS;
+INSERT INTO doc.tbl1 VALUES ('metric', 1238123, 'true');
+`
+const queries = sqlparse(query);
+
+console.log(queries.length)
+// 2
+
+console.log(queries[0].query)
+// SELECT * FROM SYS.SHARDS
+
+console.log(queries[0].type)
+// SELECT
+
+console.log(queries[0].original_query)
+// SELECT * FROM SYS.SHARDS;
+// INSERT INTO doc.tbl1 VALUES ('metric', 1238123, 'true');
+```
+### Features
+Currently, we support the same features as CrateDB java's parser:
+- First class CrateDB sql dialect support.
+- Input is case-insensitive.
+- Native errors as exceptions.
+- Dollar strings.
+
+Optional features:
+
+### Errors
+Errors are thrown as 'ParseError' e.g:
+```javascript
+ParseError: line2:9 mismatched input 'ROM' expecting {<EOF>, ';'}
+```