🧮 Adds results type

app/src/lib/utilities/result.ts

@@ -0,0 +1,22 @@
+export class Result<T, E> {
+    private constructor(
+        private readonly isSuccess: boolean, 
+        public readonly value?: T, 
+        public readonly error?: E) {}
+  
+    public static ok<T>(value: T): Result<T, null> {
+      return new Result<T, null>(true, value);
+    }
+  
+    public static fail<E>(error: E): Result<null, E> {
+      return new Result<null, E>(false, null, error);
+    }
+  
+    public isOk(): this is Result<T, null> {
+      return this.isSuccess;
+    }
+  
+    public isErr(): this is Result<null, E> {
+      return !this.isSuccess;
+    }
+}