Update README.md

README.md

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 # example-os
 An example bare bones OS template for RISC V.
 
+## Build instructions
+Install [this](https://github.com/riscv/riscv-gnu-toolchain) and do `make` to build. Do `make run` to run. It should print out a bunch of debug information related to OpenSBI and then a single `a`.
+
+## Debugging
+Execute `riscv64-unknown-elf-gdb` and run the following commands:
+```
+(gdb) symbol-file kernel
+(gdb) target remote localhost:1234
+```
+
+If you'd like to trace the execution since the beginning, uncomment the `# -S` at the end of the line in the makefile and run. This halts the emulator until a gdb connection is established.
+
+
 ## Resources
  - [OpenSBI docs](https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc)
  - [RISC V specs](https://riscv.org/technical/specifications/)