sample, obfs, string: Add samples

sample/string_obfs.cpp

@@ -0,0 +1,13 @@
+#include "../obfuscator/obfuscator.hpp"
+
+#include <iostream>
+
+template <char key>
+constexpr char xor(char c) {
+    return c ^ key;
+}
+
+int main() {
+    constexpr auto str = obfs::make_string<xor<0x20>, xor<0x20>>("Hello World !");
+    std::cout << str.decode() << std::endl;
+}