Add global extension registry to the repo.

docs/options.md

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+# Protobuf Global Extension Registry
+
+This file contains a global registry of known extensions for descriptor.proto,
+so that any developer who wishes to use multiple 3rd party projects, each with
+their own extensions, can be confident that there won't be collisions in
+extension numbers.
+
+If you need an extension number for your custom option (see [custom options](
+https://developers.google.com/protocol-buffers/docs/proto#customoptions)),
+please [send us a pull request](https://github.com/google/protobuf/pulls) to
+add an entry to this doc, or [create an issue](https://github.com/google/protobuf/issues)
+with info about your project (name and website) so we can add an entry for you.
+
+## Existing Registered Extensions
+
+1. C# port of protocol buffers
+   * Website: http://github.com/jskeet/dotnet-protobufs
+   * Extensions: 1000
+
+1. Perl/XS port of protocol buffers
+   * Website: http://code.google.com/p/protobuf-perlxs
+   * Extensions: 1001
+
+1. Objective-C port of protocol buffers
+   * Website: http://code.google.com/p/protobuf-objc
+   * Extensions: 1002
+
+1. Google Wave Federation Protocol open-source release (FedOne)
+   * Website: http://code.google.com/p/wave-protocol
+   * Extensions: 1003
+
+1. PHP code generator plugin
+   * Website: ???
+   * Extensions: 1004
+
+1. GWT code generator plugin (third-party!)
+   * Website: http://code.google.com/p/protobuf-gwt/
+   * Extensions: 1005
+
+1. Unix Domain RPC code generator plugin
+   * Website: http://go/udrpc
+   * Extensions: 1006
+
+1. Object-C generator plugin (Plausible Labs)
+   * Website: http://www.plausible.coop
+   * Extensions: 1007
+
+1. TBD (code42.com)
+   * Website: ???
+   * Extensions: 1008
+
+1. Goby Underwater Autonomy Project
+   * Website: https://launchpad.net/goby
+   * Extensions: 1009
+
+1. Nanopb
+   * Website: http://kapsi.fi/~jpa/nanopb
+   * Extensions: 1010
+
+1. Bluefin AUV Communication Extensions
+   * Website: http://www.bluefinrobotics.com
+   * Extensions: 1011
+
+1. Dynamic Compact Control Language
+   * Website: https://launchpad.net/dccl
+   * Extensions: 1012
+
+1. ScaleOut StateServer® Native C++ API
+   * Website: http://www.scaleoutsoftware.com
+   * Extensions: 1013
+
+1. FoundationDB SQL Layer
+   * Website: https://github.com/FoundationDB/sql-layer
+   * Extensions: 1014
+
+1. Fender
+   * Website: https://github.com/hassox/fender
+   * Extensions: 1015
+
+1. Vortex
+   * Website: http://www.prismtech.com/vortex
+   * Extensions: 1016
+
+1. tresorit
+   * Website: https://tresorit.com/
+   * Extensions: 1017
+
+1. CRIU (Checkpoint Restore In Userspace)
+   * Website: http://criu.org/Main_Page
+   * Extensions: 1018
+
+1. protobuf-c
+   * Website: https://github.com/protobuf-c/protobuf-c
+   * Extensions: 1019
+
+1. ScalePB
+   * Website: http://trueaccord.github.io/ScalaPB/
+   * Extensions: 1020
+
+1. protoc-gen-bq-schema
+   * Website: https://github.com/GoogleCloudPlatform/protoc-gen-bq-schema
+   * Extensions: 1021
+
+1. grpc-gateway
+   * Website: https://github.com/gengo/grpc-gateway
+   * Extensions: 1022
+
+1. Certificate Transparency
+   * Website: https://github.com/google/certificate-transparency
+   * Extensions: 1023
+
+1. JUNOS Router Telemetry
+   * Website: http://www.juniper.net
+   * Extensions: 1024
+
+1. Spine Event Engine
+   * Website: https://github.com/SpineEventEngine/core-java
+   * Extensions: 1025
+
+1. Aruba cloud platform
+   * Website: ???
+   * Extensions: 1026 -> 1030
+
+1. Voltha
+   * Website: ???
+   * Extensions: 1031 -> 1033
+
+1. gator
+   * Website: ???
+   * Extensions: 1034
+
+1. protoc-gen-flowtypes
+   * Website: https://github.com/tmc/grpcutil/tree/master/protoc-gen-flowtypes
+   * Extensions: 1035
+
+1. ProfaneDB
+   * Website: https://gitlab.com/ProfaneDB/ProfaneDB
+   * Extensions: 1036
+
+1. protobuf-net
+   * Website: https://github.com/mgravell/protobuf-net
+   * Extensions: 1037
+
+1. FICO / StreamEngine
+   * Website: http://www.fico.com/
+   * Extensions: 1038
+
+1. GopherJS
+   * Website: https://github.com/johanbrandhorst/protobuf
+   * Extensions: 1039
+
+1. ygot
+   * Website: https://github.com/openconfig/ygot
+   * Extensions: 1040
+
+1. go-grpcmw
+   * Website: https://github.com/MarquisIO/go-grpcmw
+   * Extensions: 1041
+
+1. grpc-gateway protoc-gen-swagger
+   * Website: https://github.com/grpc-ecosystem/grpc-gateway
+   * Extensions: 1042
+
+1. AN Message
+   * Website: TBD
+   * Extensions: 1043
+
+1. protofire
+   * Website: https://github.com/ribrdb/protofire
+   * Extensions: 1044
+
+1. Gravity
+   * Website: https://github.com/aphysci/gravity
+   * Extensions: 1045
+
+1. SEMI Standards – I&C Technical Committee
+   * Website: http://downloads.semi.org/web/wstdsbal.nsf/9c2b317e76523cca88257641005a47f5/88a5863a580e323088256e7b00707489!OpenDocument
+   * Extensions: 1046
+
+1. Elixir plugin
+   * Website: https://github.com/tony612/grpc-elixir
+   * Extensions: 1047
+
+1. API client generators
+   * Website: ???
+   * Extensions: 1048-1056