diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
new file mode 100644
index 0000000..e323326
--- /dev/null
+++ b/.github/workflows/c-cpp.yml
@@ -0,0 +1,23 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: configure
+      run: ./configure
+    - name: make
+      run: make
+    - name: make check
+      run: make check
+    - name: make distcheck
+      run: make distcheck
diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..169abba
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,18 @@
+pipeline {
+  agent any
+  stages {
+    stage('code pushed to github') {
+      steps {
+        echo 'Commit created to repository'
+        writeFile(file: 'output.txt', text: 'Se ha lanzado desde jenkins', encoding: 'UTF-8')
+      }
+    }
+
+    stage('secondary') {
+      steps {
+        mail(subject: 'Jenkins step', body: 'Testing', to: 'daniel.gallo1989@gmail.com')
+      }
+    }
+
+  }
+}
\ No newline at end of file
diff --git a/code/AbstractFactory/main.cpp b/code/AbstractFactory/main.cpp
index 5dc6653..120d13a 100644
--- a/code/AbstractFactory/main.cpp
+++ b/code/AbstractFactory/main.cpp
@@ -8,18 +8,28 @@ using namespace std;
 
 int main(int argc, char *argv[])
 {
+	//Create factory1
 	AbstractFactory * fc = new ConcreteFactory1();
+	
+	//Create products A and B from factory1
 	AbstractProductA * pa =  fc->createProductA();
 	AbstractProductB * pb = fc->createProductB();
+
+	//Use products A and B from factory1
 	pa->use();
 	pb->eat();
 	
+	//Create factory2
 	AbstractFactory * fc2 = new ConcreteFactory2();
+	//Create products A and B from factory2
 	AbstractProductA * pa2 =  fc2->createProductA();
 	AbstractProductB * pb2 = fc2->createProductB();
+	//Use products A and B from factory2
 	pa2->use();
 	pb2->eat();
 	
+
+	//Delete created objects for avoiding memory leaks
 	delete fc;
 	delete pa;
 	delete pb;
@@ -27,5 +37,6 @@ int main(int argc, char *argv[])
 	delete pa2;
 	delete pb2;	
 	
+	//return exit code
 	return 0;
 }
diff --git a/code/Singleton/Singleton.h b/code/Singleton/Singleton.h
index a877efc..c7eada8 100644
--- a/code/Singleton/Singleton.h
+++ b/code/Singleton/Singleton.h
@@ -15,12 +15,16 @@ class Singleton
 	virtual ~Singleton();
 	Singleton *m_Singleton;
 
+	//Entry point to method is static and public
 	static Singleton* getInstance();
+
+	//This function represents the actual operation performed over the object
 	void singletonOperation();
 
 private:
 	static Singleton * instance;
 
+	//Constructor shall be declared as private
 	Singleton();
 
 };
diff --git a/code/main/main.cpp b/code/main/main.cpp
index 3cdcdbb..8f25ba5 100644
--- a/code/main/main.cpp
+++ b/code/main/main.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 
+
 using namespace std;
 
 int main(int argc, char *argv[])