Add KONTESTS to Programming (#3021)

README.md

@@ -1343,6 +1343,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Codeforces](https://codeforces.com/apiHelp) | Get access to Codeforces data | `apiKey` | Yes | Unknown |
 | [Hackerearth](https://www.hackerearth.com/docs/wiki/developers/v4/) | For compiling and running code in several languages | `apiKey` | Yes | Unknown |
 | [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 |
 
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