Config => Add config for result folder and dockerCompose project name

ExerciceChecker/src/config/Config.ts

 class Config {
     public readonly filesFolder: string;
+    public readonly resultsFolder: string;
 
-    public exercice: {
+    public readonly exercice: {
         id: string; secret: string;
     };
 
+    public readonly dockerCompose: {
+        projectName: string
+    };
+
     constructor() {
         this.filesFolder = process.env.FILES_FOLDER || './';
+        this.resultsFolder = process.env.RESULTS_FOLDER || '';
 
         this.exercice = {
             id    : process.env.DOJO_EXERCICE_ID || '',
             secret: process.env.DOJO_SECRET || ''
         };
+
+        this.dockerCompose = {
+            projectName: process.env.DOCKER_COMPOSE_PROJECT_NAME || ''
+        };
     }
 }