Add usage sample

README.md

@@ -17,6 +17,32 @@ dependencies {
 }
 ```
 
+Usage
+----------------
+Let's say you have an existing setup with the `LiveData`:
+```kotlin
+val liveData = MutableLiveData<Boolean>()
+liveData.observe(viewLifecycleOwner) {
+  println(it)
+}
+```
+
+to migrate it you would have to use the `bindIn` function:
+```kotlin
+val liveData = MutableLiveData<Boolean>()
+viewLifecycleOwner.bindIn(liveData) {
+  println(it)
+}
+```
+
+Huh. That looks almost identical, right? The _real benefit_ is that it works for `Flow`s with the exact same syntax!
+```kotlin
+val flow = MutableStateFlow<Boolean>(false)
+viewLifecycleOwner.bindIn(flow) {
+  println(it)
+}
+```
+
 Report a bug or request a feature
 ----------------
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