Write an expanded proposal on a research topic $\text{'}\text{'}$An analysis of the Role of Green Building Materials in Promoting Sustainable Infrastructure Development in Gauteng, South Africa.$\text{'}\text{'}$ The proposal should encompass the following headings:

$1\mathrm{.}5$ Description of the Study area

$1\mathrm{.}6$ Scope of the Study

$2\mathrm{.}0$ Literature Review

$3.$ Methodology