Add docs and mod version bumping

Added and modified documentation for the contribution process.
Added the code of conduct file.
Modified bump version's conf to auto create tags and commits.

.bumpversion.cfg

@@ -1,5 +1,8 @@
 [bumpversion]
 current_version = 0.1.7
+tag = True
+commit = True
+message = 'Version update: {current_version} → {new_version}'
 
 [bumpversion:file:veilid-server/Cargo.toml]
 search = name = "veilid-server"