Add README.md

Author: flaksp

README.md

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+# JSON Schema TypeScript definitions
+
+This library contains TypeScript defitions for JSON Schema. It may be useful when you want to programmable generate JSON Schema.
+
+Following types are exposed:
+
+* `StringJsonSchema`
+* `IntegerJsonSchema`
+* `NumberJsonSchema`
+* `BooleanJsonSchema`
+* `NullJsonSchema`
+* `AnyJsonSchema` — when `type` property is not defined and type-specific properties (e.g. `maxLength` is specific to `string` type) are not defined either.