feat(metadata-schema): add metadata schema

debye_bec/scans/metadata_schema/metadata_schema_registry.py

@@ -1,6 +1,6 @@
-# from .metadata_schema_template import ExampleSchema
+#from .metadata_schema_xas_simple_scan import xas_simple_scan_schema
 
-METADATA_SCHEMA_REGISTRY = {
+METADATA_SCHEMA_REGISTRY = {#"xas_simple_scan": xas_simple_scan_schema
     # Add models which should be used to validate scan metadata here.
     # Make a model according to the template, and import it as above
     # Then associate it with a scan like so:

debye_bec/scans/metadata_schema/metadata_schema_xas_simple_scan.py

@@ -0,0 +1,6 @@
+from bec_lib.metadata_schema import BasicScanMetadata
+#
+#
+class xas_simple_scan_schema(BasicScanMetadata):
+    Edge: str
+    Element: str