Create a document for process related bits (complementary with BEMAN_STANDARD.md)

[neatudarius]

Create a document for process related bits (complementary with BEMAN_STANDARD.md). As discussed in multiple syncs , we need to introduce a new document.

The current proposal is to add BEMAN_PROCESS.md and link it with the BEMAN_STANDARD.md.
Possible current and future sections:

• Beman libraries lifetime
• Beman docs
• Integrating Beman with Compiler Explorer
• Beman infrastracture
• ...