Create README.md

Author: pawlo2102

README.md

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+# Java Link Parser
+### Here is our implimentation of Link Preview written in Java with RxJava2
+## Usage
+Initialize LinkCrawler
+```java
+LinkCrawler crawler = new LinkCrawler();
+```
+If you need to do somthing before parsing url, you can implement PreloadCallback
+```java
+public class MainActivity extends AppCompatActivity implements OnPreloadCallback
+
+ crawler.setPreloadCallback(this);
+```
+To start parsing you need to use crawler.parseUrl and pass desired url, it returs ```Flowable<Result>```
+```java
+  crawler.parseUrl("https://github.com/")
+                .subscribe(new Consumer<Result>() {
+                    @Override
+                    public void accept(@NonNull Result result) throws Exception {
+                        mainBinding.setContent(result.getmParseContent());
+                    }
+                });
+ ```
+ Result object contains ParseContent field wich contains all parsed data of passed url, such as title,description etc. 
+ #### [Kotlin version](https://github.com/VRGsoftUA/Kotlin-Link-Parser)
+License
+=================================
+
+    Copyright 2016 VRG Soft
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.