Added info to readme about using an online editor. Closes #4
Added info to readme about using an online editor. Closes #4

mrfyda/ist-dissertation-latex-template,ovieira/ist-dissertation-latex-template,FMCalisto/ist-dissertation-latex-template,samfcmc/ist-dissertation-latex-template,rtfpessoa/ist-dissertation-latex-template,mrfyda/ist-dissertation-latex-template,FMCalisto/ist-dissertation-latex-template,rtfpessoa/ist-dissertation-latex-template,ovieira/ist-dissertation-latex-template,samfcmc/ist-dissertation-latex-template