Resolve "Implement thinning algorithms"

Closes #445 (closed)

corsika/modules/thinning/EMThinning.hpp

+/*
+ * (c) Copyright 2022 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
+#pragma once
+
+#include <corsika/framework/core/PhysicalUnits.hpp>
+#include <corsika/framework/process/SecondariesProcess.hpp>
+
+namespace corsika {
+
+//! This process implements thinning for EM splitting processes (1 -> 2)
+ 
+class EMThinning : public SecondariesProcess<EMThinning> {
+public:
+    
+
+
+    /**
+     * Apply thinning to secondaries.
+     *
+     * @tparam TStackView
+     */
+    template <typename TStackView>
+    void doSecondaries(TStackView&);
+
+};
+}
+
+#include <corsika/detail/process/thinning/EMThinning.inl>