entries: add hammer smasher

see: gbdev/homebrewhub-submit#3

Author: avivace

entries/bump-dev_hammer-smasher/cover.png

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+- Butano​​ (GBA Engine) - GValiente​​
+	- https://gvaliente.github.io/butano/
+- ​ReClaimed​​ (Background Music) - TipTopTomCat​​​
+	- https://tiptoptomcat.itch.io/reclaimed

entries/bump-dev_hammer-smasher/files/credits.txt

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+{
+    "$schema": "https://raw.githubusercontent.com/gbdev/database/refs/heads/master/schemas/game-schema-d5.json",
+    "slug": "bump-dev_hammer-smasher",
+    "title": "Hammer Smasher",
+    "screenshots": [
+        "cover.png",
+        "screenshots/4JsxP4.png",
+        "screenshots/hWhyjj.png"
+    ],
+    "typetag": "game",
+    "platform": "GBA",
+    "tags": [
+        "Survival",
+        "Arena",
+        "Butano",
+        "2D"
+    ],
+    "files": [
+        {
+            "default": true,
+            "filename": "files/hammer-smasher.gba",
+            "playable": true
+        }
+    ],
+    "developer": "Bump Dev",
+    "website": "https://bump-dev.itch.io/hammer-smasher"
+}