Added basic guidelines for contributing code (#976) #494

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	22s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	23s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	34s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	40s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	35s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	45s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	50s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	41s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	41s
Syntax Check - Clang C++14 Linux STL Force C++03 (ubuntu-22.04)	44s
Syntax Check - Clang C++17 Linux No STL (ubuntu-22.04)	44s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	45s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	1m 0s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	54s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	59s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 28s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	1m 2s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 18s
	14m 25s

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