Add initial README

see #2

Signed-off-by: Andrew Berezovskyi <andriib@kth.se>

README.md

@@ -1 +1,32 @@
-TBD
+# Lyo Validation library
+
+The library is intended to check whether resource instances conform to SHACL shapes.
+
+## Getting started
+
+Add the following repository to your POM file:
+
+```xml
+<repositories>
+    <repository>
+        <id>lyo-releases</id>
+        <name>Eclipse Lyo Releases</name>
+        <url>https://repo.eclipse.org/content/repositories/lyo-releases/</url>
+        <snapshots>
+            <enabled>false</enabled>
+        </snapshots>
+    </repository>
+</repositories>
+```
+
+Now add a dependency for the library:
+
+```xml
+<dependency>
+    <groupId>org.eclipse.lyo</groupId>
+    <artifactId>lyo-validation</artifactId>
+    <version>2.3.0.M3</version>
+</dependency>
+```
+
+Start by reading up on [`Validator`](http://download.eclipse.org/lyo/docs/validation/2.3.0.M3/org/eclipse/lyo/validation/Validator.html) Javadoc.