Revert "Revert "Add renamed MuPDF README file.""
Revert "Revert "Add renamed MuPDF README file.""

This reverts commit 2321e0f07a24c8e273e149e94c525aeabfc56259.

Gitden/pdf-plugin,Gitden/pdf-plugin,Gitden/pdf-plugin,Gitden/pdf-plugin,Gitden/pdf-plugin,Gitden/pdf-plugin