Add architecture information (#11)

* Add architecture image

* Link to architecture image in README

README.md

@@ -1,16 +1,18 @@
 # Graph Explorer
 Explore and find suspicious patterns in a large graph of money transactions.
 
-![screenshot](https://github.com/entrepreneur-interet-general/graph-explorer/raw/master/docs/img/home.png)
+![home](docs/img/home.png)
 
-## Stack 
+## Architecture 
 
 * JanusGraph 0.2.1 
 * ScyllaDB 2.2.0 (storage backend for JanusGraph)
 * Elasticsearch 6.0.1 (index backend for JanusGraph)
 * Python Flask server
 * Vue.js 
 * d3.js v4 force layout
+<img src="docs/img/architecture.png" alt="architecture" width="400px">
+
 
 ## Demo 
 Start exploring the graph from any node (e.g with *Amanda Walker*) 
@@ -130,4 +132,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.