Update the readme file

README.md

@@ -1 +1,30 @@
-# tdr-metadata-validation
+# TDR Metadata Validation
+
+This validation library is used to validate closure & descriptive metadata as per the provided metadata criteria.
+If the input values have any errors then it will return a list of error codes. You can use the error codes to render the client's specific error messages.
+
+## How to use?
+
+1. Create `MetadataCriteria` for closure or descriptive metadata
+2. Create a `MetadataValidation` object with the criteria
+3. Now call the validation method (closure or descriptive) with your metadata
+
+Example:
+```scala
+import uk.gov.nationalarchives.tdr.validation._
+
+val closureMetadataCriteria = MetadataCriteria("ClosureType", Boolean, true, false, false, List("yes", "no"))
+val descriptiveMetadataCriteria = List(
+  MetadataCriteria("Property1", Text, false, false, false, Nil, None, None),
+)
+val metadataValidation = new MetadataValidation(closureMetadataCriteria, descriptiveMetadataCriteria)
+
+val metadata = List(
+  Metadata("Property1", ""),
+  Metadata("Property2", ""),
+  Metadata("Property3", "test")
+)
+
+val closureMetadataErrors = metadataValidation.validateClosureMetadata(metadata)
+val descriptiveMetadataErrors = metadataValidation.validateDescriptiveMetadata(metadata)
+```