adding liveness section in documentation

internal/app/api/api_test.go

@@ -12,9 +12,7 @@ import (
 func TestPing(t *testing.T) {
 	req := httptest.NewRequest(http.MethodGet, "/ping", nil)
 	rec := httptest.NewRecorder()
-
 	e := echo.New()
 	_ = e.NewContext(req, rec)
-
 	assert.Equal(t, http.StatusOK, rec.Code)
 }