update readme

Author: TheLartians

README.md

@@ -2,11 +2,28 @@
 
 # lars::Event
 
-A thread-safe C++11 event-listener template.
+A thread-safe C++11 event-listener template and observable value implementation.
 
 # Example
 
+## lars::Event
 
+```c++
+lars::Event<float,float> onClick;
+auto observer = onClick.createObserver([](auto x, auto y){ handleClick(x,y); });
+onClick.emit(0,0); // emits event to all observers
+observer.reset(); // removes observer from event
+```
+
+## lars::ObservableValue
+
+```c++
+ObservableValue a = 1;
+ObservableValue b = 2;
+DependentObservableValue sum([](auto a, auto b){ return a+b; },a,b);
+DependentObservableValue resultString([](auto v){ return "The result is " + std::to_string(v); }, sum);
+resultString.onChange.connect([](auto &r){ std::cout << r << std::endl; });
+```
 
 # Installation and usage