Updated the main readme file with more details

Author: joannacss

README.md

@@ -7,7 +7,7 @@ This repository shows the callgraphs generated using `SALSA` (**S**tatic **A**na
 Salsa improves existing off-the-shelf pointer analysis to support the construction of callgraph that handles programs with serialization/deserialization.
 To evaluate it, we performed the following:
 
-1. We used the test cases from the [Java Call Graph Test Suite](https://bitbucket.org/delors/jcg/src/master/jcg_testcases/src/main/resources/Serialization.md) that uses serialization/deserialization features (i.e. `Ser1`-`Ser7`).
+1. We used the nine test cases from the [Java Call Graph Test Suite](https://bitbucket.org/delors/jcg/src/master/jcg_testcases/src/main/resources/Serialization.md) that uses serialization/deserialization features (i.e. `Ser1`-`Ser9`).
 2. We compiled these test cases using JRE 1.8 and generated JAR files.
 3. We run Salsa against each test case and computed its callgraphs.
 

callgraphs/README.md

@@ -0,0 +1,20 @@
+# Call graphs
+
+
+This folder contains the visualization of the call graphs computed by `Salsa`.
+Each PDF provides the call graph computed with and without Salsa, where we can see missing edges and nodes from the call graph.
+
+Please notice that each PDF has only a **subset** of nodes and edges from the original call graph because each call graph includes many nodes from API calls.
+For the sake of clarity, each PDF only includes nodes and edges if they fulfill the following criteria:
+
+***For nodes***: 
+
+- The node correspond to a method implemented by the application (application-scope);
+- The node is non-application (i.e., primordial or extension), but it has a call back edge to an application node;
+
+
+***For edges***: 
+- All the outgoing edges from application nodes;
+- All the outgoing edges from non-application nodes but wholse target is an application node (or is in a path that will lead to a call back to the application);
+
+