Added Cypress test for adding doctor's note.

Added test that adds doctor's note to a patient and verifies if
the note has been added successfully.

Fixes #4235

cypress/e2e/patient_spec/patient_crud.cy.ts

@@ -156,6 +156,16 @@ describe("Patient Creation with consultation", () => {
     cy.get("button#submit").should("be.visible").click();
     cy.get("[data-testid='return-to-patient-dashboard']").click();
   });
+
+  it("Doctor's Note Addition", () => {
+    cy.visit(patient_url + "/notes");
+    cy.get("textarea").type("Patient Note");
+    cy.get("button").contains("Post Your Note").click();
+    cy.wait(1000);
+    cy.verifyNotification("Note added successfully");
+    cy.get("span.added_note").first().should("contain", "Patient Note");
+  });
+
   afterEach(() => {
     cy.saveLocalStorage();
   });