fix bug in stop and exit

Headers/worker.h

 #ifndef WORKER_H
 #define WORKER_H
 
+#include <atomic>
 #include <QObject>
 #include <QThread>
 #include "reconstruction.h"
@@ -12,15 +13,18 @@ class Worker : public QThread
     RecoImage* image;
     void run() override;
     ulong localCounts=0;
-    bool stopped=true;
-    bool exitted=false;
+    std::atomic<bool> stopped;
+    std::atomic<bool> exitted;
 public:
 //    explicit Worker(QObject *parent = nullptr);
     Worker(QObject *parent, const Setup* config_, RecoImage* image_) :
         QThread(parent),
         config(config_),
         image(image_)
-    {}
+    {
+        stopped=true;
+        exitted=false;
+    }
 
 //signals:
 

README.md

 # Simple GUI application for back projection image reconstruction
 
-## Use
-- Install [ROOT](https://root.cern/install/) (v6.22 or above), `qmake` and `make`.
-- Compile:
+## Prerequisites
+- Install [ROOT v6](https://root.cern/install/).
+- Install qt5 development packages
+```bash
+sudo apt-get install qt5-default qtdeclarative5-dev
+```
+
+## Build
   ```bash
   mkdir -p build
   cd build
-  qmake CONFIG+=realease ../imagerQt.pro
+  qmake -config release ../imagerQt.pro
   make
   ```
-- Run:
+## Run
 ```bash
     cd ..
     build/ImagerQt

Sources/worker.cpp

@@ -58,6 +58,7 @@ void Worker::handleStop()
 void Worker::stopExecution()
 {
     exitted = true;
+    qDebug() << "Exiting thread signal received.";
 }
 
 void Worker::handleClear()

imagerQt.pro

@@ -71,6 +71,7 @@ else: unix:!android: target.path = /opt/$${TARGET}/bin
 
 DISTFILES += \
     .gitignore \
+    Demo/Demo.gif \
     README.md
 
 RESOURCES += \