Proto commits in Clement-Jean/grpc-java-course

These 10 commits are when the Protocol Buffers files have changed:

Commit:75626f6
Author:Clement

comply with linter and add space for empty messages

The documentation is generated from this commit.

Commit:2bdc957
Author:Clement

remove newlines in dummy

Commit:df809b6
Author:Clement

comply with linter

The documentation is generated from this commit.

Commit:3308936
Author:Clement

comply with linter

Commit:a79c742
Author:Clement

redesign of API and rename author_id to author

Commit:b0babac
Author:Clement

Add documentation

Commit:5d0c59a
Author:Clement

add comment explaining that sqrt can send an INVALID_ARGUMENT

Commit:af2ebd8
Author:Clement

remove {} at the end of rpc defintions

Commit:34eb97d
Author:Clement

renaming Greet to Greeting

Commit:c2b88ca
Author:Clement

first code commit