Added Include folder

*facepalm*

include/cmd/cmd_truncate.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "cmd/cmd_base.hpp"
+#include <fstream>
+#include <ios>
+#include <stdexcept>
+#include <string>
+
+namespace fsh {
+
+    class CmdTruncate : public Command {
+
+      protected:
+        virtual void register_flags() override {
+            ArgFactory& factory = get_factory();
+            factory.add_rule<std::string>(1);
+        }
+
+        virtual void run(std::istream& in, std::ostream& out, ArgManager& args) override {
+
+            std::string filename = args.get<std::string>(0).value();
+
+            if(!std::ifstream(filename, std::ios_base::in)) {
+                throw std::runtime_error("File does not exist");
+            }
+
+            if(!std::ofstream(filename, std::ios_base::out)) {
+                throw std::runtime_error("Failed to truncate");
+            }
+
+        }
+    };
+
+}