[ADF-1723] LogService configuration (#2496)

* log levels implementation

* documentation and test

* remove logservieMock

* add logLevel in app config file

* remove semicolons

* fix pagination test

* fix test form

* silent test in production config

* fix test

docs/README.md

@@ -369,7 +369,7 @@ for more information about installing and using the source code.
 - [*Discovery api service](../ng2-components/ng2-alfresco-core/src/services/discovery-api.service.ts)
 - [*Favorites api service](../ng2-components/ng2-alfresco-core/src/services/favorites-api.service.ts)
 - [*Highlight transform service](../ng2-components/ng2-alfresco-core/src/services/highlight-transform.service.ts)
-- [*Log service](../ng2-components/ng2-alfresco-core/src/services/log.service.ts)
+- [Log service](log.service.md)
 - [*Nodes api service](../ng2-components/ng2-alfresco-core/src/services/nodes-api.service.ts)
 - [*Page title service](../ng2-components/ng2-alfresco-core/src/services/page-title.service.ts)
 - [*People content service](../ng2-components/ng2-alfresco-core/src/services/people-content.service.ts)

docs/log.service.md

@@ -0,0 +1,63 @@
+# Log Service
+
+Provide a log functionality for your ADF application.
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic Usage](#basic-usage)
+  * [Log levels](#log-levels)
+
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic Usage
+
+**app.component.ts**
+
+```ts
+import { LogService } from 'ng2-alfresco-core';
+
+@Component({...})
+export class AppComponent {
+
+    constructor(logService: LogService) {
+    }
+    
+    myMethod(){
+      this.logService.error('My error');
+      this.logService.trace('My trace')
+      this.logService.debug('My debug')
+      this.logService.info('My info')
+      this.logService.warn('My warn')
+    }
+    
+}
+```
+
+### Log levels 
+
+The log service provide 6 level of logs:
+
+Name | Level
+-|-
+TRACE |5
+DEBUG |4
+INFO |3
+WARN |2
+ERROR |1
+SILENT |0
+
+You can configure the log level setting the ***logLevel*** properties in the **app.config.json**. By default the level is TRACE.
+
+If you want set for example the log to warning:
+
+**app.config.json**
+
+```json
+{
+    "logLevel": "WARN" 
+}
+```