Update filename to README.md and improve formatting (#7855)

README.md

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+![logo](http://google.github.io/flatbuffers/fpl_logo_small.png) FlatBuffers
+===========
+
+![Build status](https://github.com/google/flatbuffers/actions/workflows/build.yml/badge.svg?branch=master)
+[![BuildKite status](https://badge.buildkite.com/7979d93bc6279aa539971f271253c65d5e8fe2fe43c90bbb25.svg)](https://buildkite.com/bazel/flatbuffers)
+[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/flatbuffers.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:flatbuffers)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/google/flatbuffers/badge)](https://api.securityscorecards.dev/projects/github.com/google/flatbuffers)
+[![Join the chat at https://gitter.im/google/flatbuffers](https://badges.gitter.im/google/flatbuffers.svg)](https://gitter.im/google/flatbuffers?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Discord Chat](https://img.shields.io/discord/656202785926152206.svg)](https:///discord.gg/6qgKs3R)
+[![Twitter Follow](https://img.shields.io/twitter/follow/wvo.svg?style=social)](https://twitter.com/wvo)
+[![Twitter Follow](https://img.shields.io/twitter/follow/dbaileychess.svg?style=social)](https://twitter.com/dbaileychess)
+
+
+**FlatBuffers** is a cross platform serialization library architected for
+maximum memory efficiency. It allows you to directly access serialized data without parsing/unpacking it first, while still having great forwards/backwards compatibility.
+
+**Go to our [landing page][] to browse our documentation.**
+
+## Supported operating systems
+- Windows
+- macOS
+- Linux
+- Android
+- And any others with a recent C++ compiler (C++ 11 and newer)
+
+## Supported programming languages
+
+Code generation and runtime libraries for many popular languages.
+
+1. C
+1. C++ - [snapcraft.io](https://snapcraft.io/flatbuffers)
+1. C# - [nuget.org](https://www.nuget.org/packages/Google.FlatBuffers)
+1. Dart - [pub.dev](https://pub.dev/packages/flat_buffers)
+1. Go - [go.dev](https://pkg.go.dev/github.com/google/flatbuffers/go)
+1. Java - [Maven](https://search.maven.org/artifact/com.google.flatbuffers/flatbuffers-java)
+1. JavaScript - [NPM](https://www.npmjs.com/package/flatbuffers)
+1. Kotlin
+1. Lobster
+1. Lua
+1. PHP
+1. Python - [PyPi](https://pypi.org/project/flatbuffers/)
+1. Rust - [crates.io](https://crates.io/crates/flatbuffers)
+1. Swift - [swiftpackageindex](https://swiftpackageindex.com/google/flatbuffers)
+1. TypeScript - [NPM](https://www.npmjs.com/package/flatbuffers)
+1. Nim
+
+## Versioning
+
+FlatBuffers does not follow traditional Semver versioning (see [rationale](https://github.com/google/flatbuffers/wiki/Versioning)) but rather uses a format of the date of the release.
+
+## Contribution
+
+* [FlatBuffers Issues Tracker][] to submit an issue.
+* [stackoverflow.com][] with [`flatbuffers` tag][] for any questions regarding FlatBuffers.
+
+*To contribute to this project,* see [CONTRIBUTING][].
+
+## Community
+
+* [FlatBuffers Google Group][] to discuss FlatBuffers with other developers and users.
+* [Discord Server](https:///discord.gg/6qgKs3R)
+* [Gitter](https://gitter.im/google/flatbuffers)
+
+
+## Security
+
+Please see our [Security Policy](SECURITY.md) for reporting vulnerabilities.
+
+## Licensing
+*Flatbuffers* is licensed under the Apache License, Version 2.0. See [LICENSE][] for the full license text.
+
+<br>
+
+   [CONTRIBUTING]: http://github.com/google/flatbuffers/blob/master/CONTRIBUTING.md
+   [`flatbuffers` tag]: https://stackoverflow.com/questions/tagged/flatbuffers
+   [FlatBuffers Google Group]: https://groups.google.com/forum/#!forum/flatbuffers
+   [FlatBuffers Issues Tracker]: http://github.com/google/flatbuffers/issues
+   [stackoverflow.com]: http://stackoverflow.com/search?q=flatbuffers
+   [landing page]: https://google.github.io/flatbuffers
+   [LICENSE]: https://github.com/google/flatbuffers/blob/master/LICENSE