Add Jaeger to list of similar projects
Add Jaeger to list of similar projects

Reference:
    - Homepage: https://uber.github.io/jaeger/
    - Github: https://github.com/uber/jaeger
    - Blog post: https://eng.uber.com/distributed-tracing/

Change-Id: I158cf1220309c51c5276221d9bf7fbc18befd619

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