Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/lib/everest/crc/tests/crc_test.cpp

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 - 2025 Pionix GmbH and Contributors to EVerest
+
+#include <everest/crc/crc.hpp>
+#include <gtest/gtest.h>
+
+TEST(CRC16_XModem, KnownVector) {
+    std::vector<std::uint8_t> data{'1', '2', '3', '4', '5', '6', '7', '8', '9'};
+    EXPECT_EQ(calculate_xModem_crc16(data), 0x31C3);
+}
+
+TEST(CRC16_XModem, EmptyInput) {
+    std::vector<std::uint8_t> data{};
+    EXPECT_EQ(calculate_xModem_crc16(data), 0x0000);
+}
+
+TEST(CRC16_XModem, MultipleBytes) {
+    std::vector<std::uint8_t> data{'E', 'V', 'E', 'R', 'E', 'S', 'T'};
+    EXPECT_EQ(calculate_xModem_crc16(data), 0x4492);
+}