Add preliminary documentation for logging-plugin
Add preliminary documentation for logging-plugin

alfredodeza/pytest,tomviner/pytest,ddboline/pytest,rmfitzpatrick/pytest,RonnyPfannschmidt/pytest,Akasurde/pytest,hackebrot/pytest,tomviner/pytest,txomon/pytest,The-Compiler/pytest,tareqalayan/pytest,markshao/pytest,davidszotten/pytest,The-Compiler/pytest,nicoddemus/pytest,pytest-dev/pytest,pfctdayelise/pytest,nicoddemus/pytest