tweak README.md formatting (code blocks), add link to firmware recovery
tweak README.md formatting (code blocks), add link to firmware recovery

dvorka/ttwatch,dlenski/ttwatch,lgrangeia/ttwatch,dvorka/ttwatch,ryanbinns/ttwatch,dlenski/ttwatch,lgrangeia/ttwatch,lgrangeia/ttwatch,ryanbinns/ttwatch,ryanbinns/ttwatch,dvorka/ttwatch,dlenski/ttwatch,lgrangeia/ttwatch,ryanbinns/ttwatch,dvorka/ttwatch,dlenski/ttwatch