add Haskell monad category and snippet of using the Maybe monad

Author: ACR1209

snippets/haskell/monads/maybe-monad.md

@@ -0,0 +1,20 @@
+---
+title: Maybe Monad
+description: Using the Maybe monad to handle computations that might fail.
+author: ACR1209
+tags: haskell, monads, maybe
+---
+
+```hs
+safeDiv :: Int -> Int -> Maybe Int
+safeDiv _ 0 = Nothing
+safeDiv x y = Just (x `div` y)
+
+main :: IO ()
+main = do
+    let result = do
+            a <- safeDiv 10 2
+            b <- safeDiv a 2
+            return b
+    print result  -- Output: Just 2
+```