Update and add ROHD-related items

[mkorbel1]

Some updates to the list for the ROHD ecosystem:

• Spelling out the acronyms where applicable
• Add ROHD-VF, the verification piece of ROHD (similar to UVM but for ROHD)
• Add the ROHD Cosim framework which enables cosimulation between ROHD design/testbench components with SystemVerilog designs, testbenches, and simulators.
• Add the ROHD Hardware Component Library, a library of pre-validated configurable hardware components in ROHD which are convertible to SystemVerilog and come with testbench components and infrastructure.

[aolofsson]

PR doesn't follow convention of readme. List is of repo names (lowercase). Please change.

[aolofsson]

Thanks!