feat(log file): read and write from log file

Wrote logic for writing logs to log.json and reading them back.

Also re-organised code.

feat(v0.0.2): start building logging client

To be consistent in the decision to keep the scope of watchman limited to development phase only.
I am avoiding using kafka and instead using local json file which will sync at specified intervals.

Currently the client library only manages printing and storing logs in a json file, will add features for syncing the file with remote db in coming versions.

v0.0.1