Resolve "Update project to validate against XSD"

Closes #274 (closed)

README.md

 # Metadata
 
 Publicly available service provider (SP)metadata for Nebraska identity providers (IdP's).
+
+In order to validate XSD your VS Code settings.json file needs to include:
+
+```json
+"xml.fileAssociations": [
+        {
+            "pattern": "nefed.xml",
+            "systemId": "docs.oasis-open.org_security_saml_v2.0_saml-schema-metadata-2.0.xsd"
+        }
+    ],
+```
+
+assuming you have the RedHat XML extension (which you should).
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