Update packages, README

Sync packages to latest commits. Add README for setting up monorepo.

README.md

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+# webvideo-transcript-summary
+
+Get transcript summaries of Web videos.
+
+## Setup
+
+Make sure to pull every submodule. As soon as submodules are initialized, refer to each of their README files for
+individual setup.

packages/core

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-Subproject commit 9252b037ca0eeb98f364ec2e7830f38276a71456
+Subproject commit 6d6a1327083c4f13135a288317897ac18bef177d

packages/web-api

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-Subproject commit 17052a87526500067578a33730b91e2bab9589df
+Subproject commit efc1c43db607fb0c2e1c0ddca3f1140823330872