Merge branch 'readme' into 'main'

Readme

See merge request roboct/definitions/json_schemas!2

README.md

@@ -30,7 +30,17 @@ This schema defines the properties for projection data in THD JSON format.
 
 ### Examples
 
-```python:../scripts/validate_thd_json.py:o:main
+```python:../scripts/validate_thd_json.py 
+from jsonschema import validate, ValidationError
+import json
+
+from pathlib import Path
+
+
+SHEMA = Path('./thd_json/projection.json')
+FILE = Path('./examples/thd_json/test_thd.json')
+
+
 def main():
     with open(str(SHEMA)) as schema_file, open(str(FILE)) as data_file:
         schema = json.load(schema_file)
@@ -47,4 +57,7 @@ def main():
             
         except ValidationError as e:
             print("Validation error:", e)
+
+if __name__ == '__main__':
+    main()
 ```