object attribute done

docs/object-attribute-system.md

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+# Object Attributes System
+
+> This document cover two notions, the edition of attributes and the impact it has relatively to the others Objects.
+
+## Edition of Attributes
+
+> There is no limit to how many attributes can be defined to an Object.
+
+In the "Object Attributes" section of the "Object Edit" Page, the first row is a form to create and append a new attribute. It requires two elements, the name of the attribute and its type (`String`, `Number`, `Boolean`, `Array`, `Object`, `Function`, `Null`). Click 'Add' to create the attribute.
+
+> Within a same Object, each attribute's name must be uniq.
+
+Once created, the new attributes appears right bellow and the ability to associate a value to it is now available. Depending on the type of the attribute, the interface will vary.
+
+- String value input is type String.
+- Number value input is type Number.
+- Booleans value input appears as a switch, true by default.
+- Arrays and Objects content are hideable / showable via the "Show/Hide content" button on the right of the attribute. There is no limit on the depth of Object/Array, however, after a certain level, the interface will start to feel narrow.
+- String value input is type String.
+- Null will not display any input.
+- Function will offer to select from all available functions, save on select.
+
+Any attribute can be delete by clicking on the 'trash' icon on the right hand of it.
+
+Here an example of how the section looks like.
+![object-attributes](https://user-images.githubusercontent.com/15313830/56677487-88675600-66b8-11e9-9781-26dc0ee6301d.png)
+
+## Attributes and RelationShips
+
+When an attributes is set to an Object, other Objects, associated to this particular Object, will have access to it. Which means that, if an Object A is added as a child of an Object B, A will embed its attributes within the instance of B.
+
+Object's attributes follow a hierarchy when associated to an other Object.
+The Original Attributes of a child, the ones defined in the original Object are the weakest ones. A Children Attribute is applied to all the children and overload the Original Attributes. Finally, child attribute is the strongest one, it overlaod Original Attributes and Children Attributes.
+
+When an object and its relationship are resolved, the three structures ("attrs", "childrenAttrs", "childAttrs") are flattened.
+
+The following json shows how the next object would be resolved.
+
+```json
+{
+  "childrenAttrs": {
+    "xp": 800
+  },
+  "children": {
+    "printalphabet": {
+      "duration": 3600,
+      "xp": 800,
+      "isBonus": true
+    }
+  }
+}
+```
+
+Children
+![children](https://user-images.githubusercontent.com/15313830/56679319-b189e580-66bc-11e9-8f2a-3d51eb1486d4.png)
+
+Child
+![chilld-capture](https://user-images.githubusercontent.com/15313830/56679320-b189e580-66bc-11e9-90ab-c8f69f531876.png)