add better description

README.md

@@ -1,5 +1,21 @@
 # Get microservice callgraph
 
+Dependencies:
+
+- [Sysdig](http://sysdig.org/)
+- go
+- rancher (only in the current setup)
+- sharelatex (only in the current setup)
+
+This project can obtaining the service graph without any application knowledge
+by inspecting network related syscalls of processes. In the current form
+it contains an integration test targeting sharelatex as an application and
+expect a rancher cluster to resolve ips back to hostnames. This could be
+generalized later on.
+
+The reusable part of this project is probably capture-connections.lua, which can
+be used to get information from sysdig.
+
 ```
 $ go get github.com/mic92/clusterssh
 $ go build .