Implement persistent interactive shell module

modules/Shell/tests/testsShell.cpp

@@ -0,0 +1,25 @@
+#include "../Shell.hpp"
+#include <iostream>
+
+int main()
+{
+    Shell shell;
+    std::vector<std::string> cmd = {"shell"};
+    C2Message msg, ret;
+    shell.init(cmd, msg);
+    shell.process(msg, ret);
+
+    cmd = {"shell", "echo", "hello"};
+    shell.init(cmd, msg);
+    msg.set_cmd("echo hello");
+    shell.process(msg, ret);
+    bool ok = ret.returnvalue().find("hello") != std::string::npos;
+
+    cmd = {"shell", "exit"};
+    shell.init(cmd, msg);
+    msg.set_cmd("exit");
+    shell.process(msg, ret);
+
+    std::cout << (ok ? "[+]" : "[-]") << " shell test" << std::endl;
+    return ok ? 0 : 1;
+}