Add softwium to Programming

Add a SQL checker API to Programming

README.md

@@ -1388,6 +1388,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Judge0 CE](https://ce.judge0.com/) | Online code execution system | `apiKey` | Yes | Unknown |
 | [KONTESTS](https://kontests.net/api) | For upcoming and ongoing competitive coding contests | No | Yes | Unknown |
 | [Mintlify](https://docs.mintlify.com) | For programmatically generating documentation for code | `apiKey` | Yes | Yes |
+| [Softwium](https://softwium.com/sql-validator/) | Validate SQL queries | No | Yes | No |
 
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