chore(diagram): add diagram code (#426)

Just adding the Diagram code

diagrams/dgraph.py

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+from diagrams import Cluster, Diagram, Edge
+from diagrams.programming.language import Go, Nodejs, Python
+from diagrams.custom import Custom
+
+graph_attr = {
+    "layout":"dot",
+    "compound":"true",
+    "splines":"spline",
+    }
+
+zeros_attr = {
+    "icon_path":"./dgraphlg.png"
+}
+
+ec2_attr = {
+    "icon_path":"./dgraphlgEC2.png"
+}
+
+with Diagram("\ndgraph", show=False, direction="TB", graph_attr=graph_attr, outformat='png') as diag:
+    with Cluster("RAFT Groups / Cluster (Baremetal example)"):
+        with Cluster("0", graph_attr={"label":"Zero Group"}):
+            a = Custom("Zero 2",  **zeros_attr)
+            b = Custom("Zero 1",  **zeros_attr)
+            c = Custom("Zero 0",  **zeros_attr)
+
+        with Cluster("1", graph_attr={"label":"Alpha Group"}):
+            e = Custom("Alpha 4",  **ec2_attr)
+            f = Custom("Alpha 5",  **ec2_attr)
+            g = Custom("Alpha 6",  **ec2_attr)
+            h = Custom("Alpha 3",  **ec2_attr)
+            i = Custom("Alpha 2",  **ec2_attr)
+            j = Custom("Alpha 1",  **ec2_attr)
+            h = Custom("Alpha 0",  **ec2_attr)
+
+    with Cluster("2", graph_attr={"label":"APIs"}):
+        e1 = Custom("RAW HTTP", "./http.png")
+        f1 = Custom("gRPC", "./grpc.png") 
+        g1 = Custom("GraphQL ", "./GraphQL_Logo.png")
+
+    with Cluster("3", graph_attr={"label":"Special Node(EE)"}):
+        Learner = Custom("Learner 0",  **ec2_attr)
+
+    with Cluster("4", graph_attr={"label":"Clients"}):
+        client2 = Custom("Apollo GraphQL ", "./apollo.png")
+        client3 = Nodejs("Dgraph-JS")
+        client4 = Python("Pydgraph")
+        client0 = Go("Dgo")
+        client1 = Custom("Curl", "./curl.png")
+
+    b >> Edge(lhead="cluster_1") >> f
+
+    g >> Edge(ltail="cluster_1") >> Learner
+    e >> Edge(ltail="cluster_2") >> e1
+
+    g1 >> Edge(lhead="cluster_4") >> client2
+    f1 >> Edge(lhead="cluster_4") >> client0
+    e1 >> Edge(lhead="cluster_4") >> client1
+
+diag

diagrams/readme.md

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+
+# Create a new Diagram
+
+sudo apt install graphviz
+
+pip install diagrams
+
+python3 dgraph.py