add doc under external

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vcptr 2019-10-19 10:38:27 +08:00
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# Note
The `external` dir in the project exists for historical reasons. We will migrate to use go mod to maintain 3rd party libraries.
Fow now, all modules under external are used by "quic-go" to support quic protocol, and can't migrate without a breaking change.
The plan is that we will remove the whole `external` dir when `quic-go` is tested to be matured enough in production.