Added component definitions to add weight as a valid definition (#1061)

Added the required validation information
Updated the readme

schema/components.json

@@ -594,6 +594,27 @@
                 }
             },
             "required": ["name"]
+        },
+
+        "weight": {
+            "type": "object",
+            "properties": {
+                "value": {
+                    "type": "number",
+                    "minimum": 0,
+                    "multipleOf": 0.01
+                },
+                "unit": {
+                    "type": "string",
+                    "enum": [
+                        "kg",
+                        "g",
+                        "lb",
+                        "oz"
+                    ]
+                }
+            },
+            "required": ["value", "unit"]
         }
 
     }