feat(post suggestion function): 건의사항을 보내는 api 함수 분리

src/apis/suggestion/post-suggestion.ts

@@ -0,0 +1,18 @@
+import http from '@apis/http';
+import { SERVER_URL } from '@config/index';
+
+const postSuggestion = async (value: string | undefined) => {
+  await http.post(
+    `${SERVER_URL}/api/suggestion`,
+    {
+      content: value,
+    },
+    {
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    },
+  );
+};
+
+export default postSuggestion;