[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS-Plus/Source/AWS/sigv4/docs/doxygen/pages.dox

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+/**
+@mainpage Overview
+@anchor sigv4
+@brief AWS SigV4 Library
+
+The AWS SigV4 Library is a standalone library for generating signatures
+and authorization headers according to the specifications of the AWS Signature
+Version 4 signing process. This library aids applications in sending direct
+HTTP requests to AWS services requiring SigV4 authentication. The library is
+written in C and designed to be compliant with ISO C90 and MISRA C and has no
+dependencies on any additional libraries other than the standard C library.
+
+@section sigv4_memory_requirements Memory Requirements
+@brief Memory requirements of the SigV4 Library.
+
+@include{doc} size_table.md
+
+@section sigv4_design Design
+@brief SigV4 Library Design
+
+<h3>Memory Usage</h3>
+<p>
+All functions in the SigV4 library operate only on the buffers provided and use only
+local variables on the stack.
+</p>
+
+<h3>Compliance & Coverage</h3>
+
+<p>
+The SIGV4 library is designed to be compliant with ISO C90 and MISRA C:2012.
+All functions are written to have low complexity scores. Unit tests and CBMC
+proofs are written to cover every path of execution and achieve 100% branch
+coverage.
+</p>
+
+The diagram below demonstrates the happy path an application can take to use
+the SigV4 library to interact with AWS Services that support SigV4 authentication via HTTP requests.
+
+@image html sigv4_design.png "SigV4 Library Usage diagram" width=90%
+
+*/
+
+/**
+@page sigv4_config Configurations
+@brief Configurations of the AWS SigV4 Library.
+<!-- @par configpagestyle allows the @section titles to be styled according to
+     style.css -->
+@par configpagestyle
+
+Configuration settings are C pre-processor constants. They can be set with a
+`\#define` in the config file (`sigv4_config.h`) or by using a
+compiler option such as -D in gcc.
+
+@section SIGV4_DO_NOT_USE_CUSTOM_CONFIG
+@copydoc SIGV4_DO_NOT_USE_CUSTOM_CONFIG
+
+@section sigv4_logerror LogError
+@copydoc LogError
+
+@section sigv4_logwarn LogWarn
+@copydoc LogWarn
+
+@section sigv4_loginfo LogInfo
+@copydoc LogInfo
+
+@section sigv4_logdebug LogDebug
+@copydoc LogDebug
+*/
+
+/**
+@page sigv4_functions Functions
+@brief Primary functions of the AWS SigV4 library:<br><br>
+@subpage sigV4_generateHTTPAuthorization_function <br>
+@subpage sigV4_awsIotDateToIso8601_function <br>
+
+@page sigV4_generateHTTPAuthorization_function SigV4_GenerateHTTPAuthorization
+@snippet sigv4.h declare_sigV4_generateHTTPAuthorization_function
+@copydoc SigV4_GenerateHTTPAuthorization
+
+@page sigV4_awsIotDateToIso8601_function SigV4_AwsIotDateToIso8601
+@snippet sigv4.h declare_sigV4_awsIotDateToIso8601_function
+@copydoc SigV4_AwsIotDateToIso8601
+*/
+
+<!-- We do not use doxygen ALIASes here because there have been issues in the past versions with "^^" newlines within the alias definition. -->
+/**
+@defgroup sigv4_enum_types Enumerated Types
+@brief Enumerated types of the SigV4 library
+
+@defgroup sigv4_struct_types Struct Types
+@brief Struct types of the SigV4 library
+*/