fill README

README.md

@@ -1 +1,25 @@
 # SauceNaoAPI
+
+It is wrapper for [SauceNAO](https://saucenao.com/) API. For now, library is
+in preview state. It can be fully used, but some of info can be unavailable from
+wrapper classes.
+
+## Requester
+
+For the requests we are using `SauceNaoAPI` object. Unfortunately, for now it
+supports only url strings as source of request. For example:
+
+```kotlin
+val key = // here must be your Sauce NAO API key
+val requestUrl = // here must be your link to some image
+
+val api = SauceNaoAPI(key)
+api.use {
+    println(
+        it.request(requestUrl)
+    )
+}
+```
+
+Most of others requests use the same etymology and meaning as in the
+`SauceNAO` API docs.