couple more schema->columns renames

Author: tpellissier

README.md

@@ -218,7 +218,7 @@ table_info = client.create_table("new_Product", {
 # Create with custom primary column name and solution assignment
 table_info = client.create_table(
     table_schema_name="new_Product",
-    schema={
+    columns={
         "new_Code": "string",
         "new_Price": "decimal"
     },

src/PowerPlatform/Dataverse/client.py

@@ -469,15 +469,15 @@ class ItemStatus(IntEnum):
                     ACTIVE = 1
                     INACTIVE = 2
 
-                schema = {
+                columns = {
                     "new_Title": "string",      # Note: includes 'new_' customization prefix value
                     "new_Quantity": "int",
                     "new_Price": "decimal",
                     "new_Available": "bool",
                     "new_Status": ItemStatus
                 }
 
-                result = client.create_table("new_SampleItem", schema)
+                result = client.create_table("new_SampleItem", columns)
                 print(f"Created table: {result['table_logical_name']}")
                 print(f"Columns: {result['columns_created']}")