add event-management documentation file with first description of how to set object attributes

docs/event-management.md

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+# Events management
+
+## Usage
+> An event is associated to an object when the usage of this object implies:
+>   * a limited capacity of people
+>   * a limited time
+
+> Event management require:
+>   * Edition of the attributes of the object on which the event is based
+>   * Creation and settings of the event associated to the initial object
+
+## Settings for the initial object
+
+> Important indications:
+>   * Objects that doesn't have required attributes for event creation will not be open to event creation. 
+> | name                 | fullfillment |
+> | -------------------- | ---------    |
+> | capacity             | **required** |
+> | eventDuration        | **required** |
+> | registrationDuration | **required** |
+> | description          | optionnal    |
+> | eventStartDelay      | optionnal    |
+>   * All the attributes filled in the object are used as values by default for event's creation; it can be overloaded for each event related to the initial object.
+>   * If the initial object has a child or children which are events itself, settings are also required for each event child.
+
+#### Edit the object attributes:
+> in *Object attributes*
+
+<img width="1073" alt="Capture d’écran 2019-08-22 à 11 40 34" src="https://user-images.githubusercontent.com/35296671/63525316-64e0da80-c4f5-11e9-9e61-57d5a73da9b1.png">
+
+* Add a new key **capacity** of type `Number` with the maximum number of persons you want for events related to the object by default
+* Add a new key **eventDuration** of type `Number` with the duration in minutes you want for events related to the object by default
+* Add a new key **registrationDuration** of type `Number` with the duration in minutes you want to allow to people to register to the event by default
+* Add a new key **eventStartDelay** of type `Number`, if you want a default delay between the end of registration and the beginning of the event. This duration is expressed in minutes.
+* Add a new key **description** of type `String`, if you need to associate some informations to your event (description, location, access, documents to provide, etc.)
+
+#### Edit the children
+> in *Children*
+
+<img width="609" alt="Capture d’écran 2019-08-22 à 15 43 43" src="https://user-images.githubusercontent.com/35296671/63525543-c86b0800-c4f5-11e9-8820-60d9ff33994f.png">
+
+* Add a new key **startAfter** of type `Number`, with the default delay you want between the beginning of the event and the beginning of the child event. This duration is expressed in minutes.
+
+##### Example
+
+Here is an example of the `piscine-go` settings. It presents the settings of the object attributes `piscine-go`, the settings of one of its child which is an event and the settings of the child object attributes itself. 
+
+> NB : this object settings are provided in the admin, in the curses section: 'Piscine Go' and in the exams section 'Exam 01'.
+
+**Piscine Go**
+*Object attributes*
+```json
+{
+  "capacity": 400,
+  "eventDuration": 37440,
+  "registrationDuration": 43200,
+  "eventStartDelay": 240
+}
+```
+
+*Children*
+> In the `piscine-go`, children of type *exam* and *rush* have events itself. 
+
+> A **startAfter** key has to be defined for each of them, in their parent object `piscine-go`. For example, the exam-01 gets this key:
+
+```json
+{
+  "startAfter": 400
+}
+```
+
+**Exam 01**
+> The object `Exam 01`, which is a child of `Piscine Go`, has its own *Object Attributes* filled in the child object.
+
+*Object attributes*
+```json
+{
+  "eventDuration": 240,
+  "registrationDuration": 2160,
+  "eventStartDelay": 60
+}
+```
+> NB: the **capacity** attribute is herited from the parent object `Piscine Go here`
+
+## Create the event
+
+### Create a new event for your object
+
+### Settings for you event
+
+> In the event you have created, 3 categories must be checked:
+> 1. General settings
+> 2. Registration's settings
+> 3. Event's settings
+
+#### General settings
+#### Registration
+#### Event