Create holomorphic_zero.lean

Nevanlinna/holomorphic_zero.lean

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+import Nevanlinna.holomorphic
+
+
+def zeroDivisor
+  {f : ℂ → ℂ}
+  {R : ℝ}
+  (h₁f : ∀ z ∈ Metric.closedBall z R, HolomorphicAt f z)
+  (h₂f : ∃ z ∈ Metric.closedBall z R, f z ≠ 0) :
+  ℂ → ℕ := by
+  sorry