Create README.md

README.md

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+# json-schema
+json schema for json-api
+
+## maven dependency
+
+```xml
+<!-- api only -->
+<dependency>
+  <groupId>${project.groupId}</groupId>
+  <artifactId>json-schema-api</artifactId>
+  <version>0.1.0-SNAPSHOT</version>
+</dependency>
+<!-- default impl. -->
+<dependency>
+  <groupId>${project.groupId}</groupId>
+  <artifactId>json-schema-core</artifactId>
+  <version>0.1.0-SNAPSHOT</version>
+</dependency>
+```
+
+## create a jsonschema instance
+```java
+final JsonSchema schema = JsonSchemas.load("{}");
+```
+
+## validate a json instance againts a schema
+```java
+if (schema.validator().isValid("{}")) {
+  processJson("{}");
+} else {
+  throws new IllegalArgumentException("Json is not valid");
+}
+```
+
+## extend with own keywords (define a vocabulary)
+
+Provide a service of type `io.github.sebastiantoepfer.jsonschema.vocabulary.spi.LazyVocabularies`  
+Provide a implemention of type `io.github.sebastiantoepfer.jsonschema.Vocabulary`  
+
+To use your new Vocabulary put it into the classpath define it in the schema:
+```
+{
+  $vocabulary: {
+    "<id of your vocabulars>": true //or false if is not required -> means validtion works also if it is not in classpath
+  }
+}
+```