Test the Following Series for Convergence or Divergence $\sum _ { n = 1 } ^ { \infty } \frac { ( - 1 ) ^ { n } } { \sqrt { n + 3 } }$

Test the following series for convergence or divergence: $\sum _ { n = 1 } ^ { \infty } \frac { ( - 1 ) ^ { n } } { \sqrt { n + 3 } }$ .