Add readme file

Change-Id: Ie50c901a1d878ab6517b6a7504de9e9c87134635
Issue-ID: DCAEGEN2-1447
Signed-off-by: pwielebs <piotr.wielebski@nokia.com>

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+DCAE SDK
+===============
+Because most services and collectors deployed on DCAE platform relies on similar microservices a common Software Development Kit has been created. It contains utilities and clients which may be used when getting configuration from CBS, consuming messages from DMaaP, interacting with A&AI, etc. SDK is written in Java.
+
+## Reactive programming
+Most of SDK APIs are using Project Reactor, which is one of available implementations of Reactive Streams (as well as Java 9 Flow). This way we support both high-performance, non-blocking asynchronous clients and old-school, thread-bound, blocking clients. We believe that using reactive programming can solve many cloud-specific problems for us - if used properly.
+
+## Artifacts
+
+#### Current version
+```
+<properties>
+  <sdk.version>1.1.4</sdk.version>
+</properties>
+```
+#### Maven dependencies
+```
+<dependencies>
+  <dependency>
+    <groupId>org.onap.dcaegen2.services.sdk.rest.services</groupId>
+    <artifactId>cbs-client</artifactId>
+    <version>${sdk.version}</version>
+  </dependency>
+ 
+  <dependency>
+    <groupId>org.onap.dcaegen2.services.sdk.security.crypt</groupId>
+    <artifactId>crypt-password</artifactId>
+    <version>${sdk.version}</version>
+  </dependency>
+ 
+  <dependency>
+    <groupId>org.onap.dcaegen2.services.sdk</groupId>
+    <artifactId>hvvesclient-producer-api</artifactId>
+    <version>${sdk.version}</version>
+  </dependency>
+  <dependency>
+    <groupId>org.onap.dcaegen2.services.sdk</groupId>
+    <artifactId>hvvesclient-producer-impl</artifactId>
+    <version>${sdk.version}</version>
+    <scope>runtime</scope>
+  </dependency>
+ 
+ <!-- more to go -->
+ 
+</dependencies>
+```
+
+## Changelog 
+Below link is a reference to an internet site which contains information about the changelog.
+[DCAE_SDK_Changelog](https://wiki.onap.org/display/DW/DCAE+SDK+Changelog)
+
+
+## License
+
+Copyright (C) 2018-2019 NOKIA Intellectual Property. All rights reserved.
+[License](http://www.apache.org/licenses/LICENSE-2.0)
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