Added basic guidelines for contributing code #493

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	27s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	29s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	36s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	42s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	38s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	42s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	38s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	39s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	46s
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)	45s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	47s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	58s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	57s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	59s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	1m 6s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 18s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 27s
	14m 38s

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