create service to manage bs versions in front

src/renderer/services/bs-version-manager.service.ts

@@ -0,0 +1,38 @@
+import { BSVersion } from "../../main/services/bs-version-manager.service";
+import { BehaviorSubject } from "rxjs";
+
+export class BSVersionManagerService {
+
+    private static instance: BSVersionManagerService;
+
+    public readonly installedVersions$: BehaviorSubject<BSVersion[]> = new BehaviorSubject([]);
+    public readonly availableVersions$: BehaviorSubject<BSVersion[]> = new BehaviorSubject([]);
+
+    private constructor(){
+        window.electron.ipcRenderer.on('bs-version.request-versions', (versions: BSVersion[]) => {
+            this.availableVersions$.next(versions);
+            console.log("ouiiii");
+            console.log(this.availableVersions$.value);
+        });
+        window.electron.ipcRenderer.on('bs-version.installed-versions', (versions: BSVersion[]) => {
+            this.installedVersions$.next(versions);
+        });
+
+        this.askAvailableVersions();
+        this.askInstalledVersions();
+    }
+
+    public static getInstance(){
+        if(!BSVersionManagerService.instance){ BSVersionManagerService.instance = new BSVersionManagerService(); }
+        return BSVersionManagerService.instance;
+    }
+
+    public askAvailableVersions(): void{
+        window.electron.ipcRenderer.sendMessage("bs-version.request-versions", null);
+    }
+
+    public askInstalledVersions(): void{
+        window.electron.ipcRenderer.sendMessage("bs-version.installed-versions", null);
+    }
+
+}