Add pointers embedding QUICHE in README.md.
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# QUICHE
-QUICHE (QUIC, Http/2, Etc) is Google's implementation of QUIC and related
-protocols. It powers Chromium as well as Google's QUIC servers and some other
-projects. QUICHE is only supported on little-endian platforms.
+QUICHE stands for QUIC, Http/2, Etc. It is Google's production-ready
+implementation of QUIC, HTTP/2, HTTP/3, and related protocols and tools. It
+powers Google's servers, Chromium, Envoy, and other projects. It is actively
+developed and maintained.
-Code can be viewed in CodeSearch in Quiche and is imported into
-[Chromium](https://source.chromium.org/chromium/chromium/src/+/master:net/third_party/quiche/src).
+The canonical open-source QUICHE repository is at
+https://quiche.googlesource.com/quiche.
+
+To embed QUICHE in your project, platform APIs need to be implemented and build
+files need to be created. Note that it is on the QUICHE team's roadmap to
+include default implementation for all platform APIs and to open-source build
+files. In the meanwhile, take a look at open source embedders like Chromium and
+Envoy to get started:
+
+* Platform implementations in Chromium:
+ + [quic/platform](https://source.chromium.org/chromium/chromium/src/+/main:net/net/quic/platform/impl/)
+ + [http2/platform](https://source.chromium.org/chromium/chromium/src/+/main:net/net/http2/platform/impl/)
+ + [quiche/common/platform](https://source.chromium.org/chromium/chromium/src/+/main:net/quiche/net/quiche/common/platform/impl/)
+* [Build file in Chromium](https://source.chromium.org/chromium/chromium/src/+/main:net/third_party/quiche/BUILD.gn)
+* [Platform implementations in Envoy](https://github.com/envoyproxy/envoy/tree/master/source/common/quic/platform)
+* [Build file in Envoy](https://github.com/envoyproxy/envoy/blob/main/bazel/external/quiche.BUILD)
+
+QUICHE is only supported on little-endian platforms.
