feat(loader): Add doc for loader

docs/ecolyo/functionalities/initialization.md

@@ -139,3 +139,37 @@ UserDuelEntity {
 ### Data managment schema
 
 ![Data Scheme](/img/challengeFlow.png)
+
+### Loader
+
+The initialization process displays progression steps in the splash screen so the user can see what is happening while it is loading. Each initialization function set an error if it fails, which is shown on the Slpash error screnn.
+
+Available loading steps are the followings :
+
+````
+  MIGRATION = 0,
+  CONSENT = 1,
+  PROFILE = 2,
+  ECOGESTURE = 3,
+  CHALLENGES = 4,
+  PRICES = 5,
+  CONSOS = 6,
+
+```
+
+Possible errors are the followings :
+
+```
+  MIGRATION_ERROR = 'migration_error',
+  CONSENT_ERROR = 'consent_error',
+  PROFILE_ERROR = 'profile_error',
+  PROFILETYPE_ERROR = 'profileType_error',
+  ECOGESTURE_ERROR = 'ecogesture_error',
+  CHALLENGES_ERROR = 'challenges_error',
+  ANALYSIS_ERROR = 'analysis_error',
+  INDEX_ERROR = 'index_error',
+  PRICES_ERROR = 'prices_error',
+  CONSOS_ERROR = 'consos_error',
+  PARTNERS_ERROR = 'partners_error',
+  UNKNOWN_ERROR = 'unknown_error',
+```