Sublime | .gitignore

Sublime project and workspace: REMOVED
.gitignore: UPDATED
Core ARM code created

RCC: Configured
GPIO: set to GPIOA output port and USART1 port
USART1: set to RX and TX
NVIC: Set to USART1 RXNE
USART1_IRQ_HANDLER: tested and working
SysTick_Handler: tested and working