add validate entities task

cmem_plugin_validation/validate_entities/__init__.py

@@ -0,0 +1 @@
+"""validate entities."""

cmem_plugin_validation/validate_entities/state.py

@@ -0,0 +1,19 @@
+"""JSON validation process state"""
+
+
+class State:
+    """State of a validation process"""
+
+    def __init__(self):
+        self.total = 0
+        self.violations = 0
+        self.violations_messages = []
+
+    def increment_total(self) -> None:
+        """Increment total"""
+        self.total += 1
+
+    def add_violations_message(self, message: str) -> None:
+        """Add violation message"""
+        self.violations += 1
+        self.violations_messages.append(message)