updated requirements file for graph creation

src/data-hub/community-detection-microservice/app/requirements.txt

@@ -7,6 +7,7 @@ Click==7.0
 clickclick==1.2.2
 connexion==2.6.0
 cycler==0.10.0
+decorator==4.4.1
 Flask==1.1.1
 idna==2.8
 importlib-metadata==1.5.0
@@ -21,9 +22,9 @@ lazy-object-proxy==1.4.3
 MarkupSafe==1.1.1
 matplotlib==3.1.3
 mccabe==0.6.1
+networkx==2.4
 numpy==1.18.1
 openapi-spec-validator==0.2.8
-# pkg-resources==0.0.0
 pycodestyle==2.5.0
 pylint==2.4.4
 pymongo==3.10.1