Typo in README.md

[jhnphm]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug
First section header lacks space between # and core Flight System (cFS) CFDP Application (CF)

To Reproduce
Observe that "#core Flight System (cFS) CFDP Application (CF)" is literal and does not look like a section header

Expected behavior
"core Flight System (cFS) CFDP Application (CF)" looks like a section header

Code snips
main...jhnphm:patch-1

System observed on:
N/A

Additional context
N/A

Reporter Info
John N Pham, Northrop Grumman