Update README (#5)

README.md

@@ -1,3 +1,25 @@
 # Geld
 
-A library to easily handle currency conversions
+A library to easily handle currency conversions.
+
+
+## Official documentation
+- We do not have an official documentation yet, we are working on this.
+
+## Data origin
+Currently the API uses the https://theforexapi.com/api to get the values.
+We are working to make it extensable so you can pick info from different sources in the future.
+
+
+## How to install
+
+```
+pip install geld
+```
+
+## How to use the Sync Client
+
+```
+from geld.clients import sync_client as client
+result = client.convert_currency("USD", "BRL", 25, "2021-12-05")
+```