Vietnamese translation

Guidelines for reviewers:

• Try to pick up all of the files from the same week. Most of the times, EN files from the same week are homogeneous in writers, topics, and style. We wish to keep the structure consistent also in the IT files. Especially if the IT translations are authored by different people, try to keep the translation of terms, particularly the technical and mathematical ones, consistent throught the files.
• Try to keep the translation of terms consistent with the #Terms table below. If you're unsure about a translation, ask on Slack, have no fear :)
• After having completed the review, create another Pull Request. Write the PR number in the Notes column of the workload distribution, like so "Reviewed (#000)". When the PR is approved, write Review approved in the same column.

Workload distribution

File name	Translator	Start Date	Publish Date	Reviewers	PR	Notes
README.md	Huynh Nguyen	Sept 16, 2020	:-----------	:-------	:----	:-----
overview.md	Huynh Nguyen	Sept 16, 2020	:-----------	:-------	:----	:-----