[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/test/unit-test/README.md

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+# Unit Tests for FreeRTOS-Plus-TCP library
+This directory is made for the purpose of Unit testing and tries to provide the tools for developing unit tests. To that end, this directory submodules the [CMock](https://github.com/ThrowTheSwitch/CMock) framework (which submodules [Unity](https://github.com/throwtheswitch/unity/tree/cf949f45ca6d172a177b00da2.3.1607b97bc7a7)) and the [FreeRTOS-Kernel](https://github.com/FreeRTOS/FreeRTOS-Kernel/).
+
+## Getting Started
+### Prerequisites
+You can run this on any GNU Make compatible systems. But in case of DOS based systems some tweaking is required with the makefile.
+To compile and run this project successfully, you must have the following:
+1. Make (You can check whether you have this by typing `make --version`)
+    - Not found? Try `apt-get install make`.
+2. Ruby (You can check whether you have this by typing `ruby --version`)
+    - Not found? Try `apt-get install ruby`.
+3. CMake version > 3.13.0 (You can check whether you have this by typing `cmake --version`)
+    - Not found? Try `apt-get install cmake`
+    - Try the `cmake --version` command. If still the version number is >= 3.13.0, skip to (4.) or else, continue.
+    - You will need to get the latest CMake version using curl or wget (or similar command).
+        - Uninstall the current version of CMake using `sudo apt remove --purge --auto-remove cmake`.
+        - Download the 3.13.0 version using `wget https://cmake.org/files/v3.13/cmake-3.13.0.tar.gz`.
+        - Extract the cmake download using `tar -xzvf cmake-3.13.0.tar.gz`.
+        - Go to the extracted folder (`cd cmake-3.13.0`) and run `./bootstrap`.
+        - Run `make -j$(nproc)' and then run `sudo make install`.
+        - Check the version using `cmake --version` command.
+4. lcov version 1.14 ( check with --version option )
+    - 'sudo apt-get install lcov'
+5. unifdef version 2.10 ( check with -V option )
+    - 'sudo apt-get install unifdef'
+6. Download the repo and include the submodules using the following commands.
+    - `git clone https://github.com/FreeRTOS/FreeRTOS.git ./FreeRTOS_Dir`
+    - `git submodule update --checkout --init --recursive tools/CMock test/FreeRTOS-Kernel`
+
+### To run the Unit tests:
+Go to the root directory of the FreeRTOS+TCP repo and run the following script:
+~~~
+#!/bin/bash
+# This script should be run from the root directory of the FreeRTOS+TCP repo.
+
+if [[ ! -f FreeRTOS_IP.c ]]; then
+    echo "Please run this script from the root directory of the FreeRTOS+TCP repo."
+    exit 1
+fi
+
+UNIT_TEST_DIR="test/unit-test"
+BUILD_DIR="${UNIT_TEST_DIR}/build/"
+
+# Create the build directory using CMake:
+rm -rf ${BUILD_DIR}
+cmake -S ${UNIT_TEST_DIR} -B ${BUILD_DIR}
+
+# Create the executables:
+make -C ${BUILD_DIR} all
+
+pushd ${BUILD_DIR}
+# Run the tests for all units
+ctest -E system --output-on-failure
+popd
+
+# Calculate the coverage
+make -C ${BUILD_DIR} coverage
+lcov --list --rc lcov_branch_coverage=1 ${BUILD_DIR}coverage.info
+~~~
+
+You should see an output similar to this:
+
+```
+-----------------------
+6 Tests 0 Failures 0 Ignored 
+OK
+Capturing coverage data from .
+... <Skipped some lines here for the sake of brevity>
+Overall coverage rate:
+  lines......: 84.8% (56 of 66 lines)
+  functions..: 85.7% (12 of 14 functions)
+  branches...: 50.0% (2 of 4 branches)
+```
+
+And also:
+
+```
+Reading tracefile test/unit-test/build/coverage.info
+                                |Lines       |Functions  |Branches    
+Filename                        |Rate     Num|Rate    Num|Rate     Num
+======================================================================
+[/home/hein/freertos_plus_tcp/]
+FreeRTOS_ARP.c                  | 100%    238| 100%    14|99.3%    137
+FreeRTOS_DHCP.c                 |98.7%    314|92.9%    14| 100%    150
+FreeRTOS_Sockets.c              | 3.5%   1150| 1.6%    61| 4.2%    722
+FreeRTOS_Stream_Buffer.c        | 100%    107| 100%    12| 100%     54
+FreeRTOS_UDP_IP.c               | 100%     97| 100%     2| 100%     58
+======================================================================
+                          Total:|41.6%   1906|40.8%   103|38.2%   1121
+```