Update README.md

Ukrainska Pravda dataset gathered as part of my Master's Thesis. Better documentation and source code will be uploaded later.

```
#contact me through this email until then
name = 'serhii'
email = f"{name}@{name}.net"
```

README.md

@@ -1,3 +1,8 @@
 ---
 license: cc-by-nc-4.0
----
+language:
+- uk
+- en
+- ru
+pretty_name: Ukrainska Pravda articles in ukr/rus/eng published on or after 01.01.2022
+---