Add a page for FU

dat/fu.md

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+% FU: Framework Ultimatum
+
+FU is the Perl backend web framework developed for
+[VNDB.org](https://vndb.org/) and [Manned.org](https://manned.org/). It is the
+successor of [TUWF](/tuwf).
+
+## Main features
+
+- Simple, conventional and synchronous architecture.
+- Powerful debugging facilities.
+- Includes a minimal HTTP server for local development and a more efficient
+  FastCGI server for production environments.
+- High-performance output compression through
+  [libdeflate](https://github.com/ebiggers/libdeflate),
+  [zlib-ng](https://github.com/zlib-ng/zlib-ng) and/or
+  [brotli](https://brotli.org/), whichever is available.
+- Includes a process supervisor with file change detection and zero-downtime
+  reloads.
+- Includes a [concise yet powerful schema-based input validation
+  module](/fu/man/validate).
+- Includes a small but high-performance JSON encoder and decoder.
+- Includes high-performance [HTML and XML generation
+  functions](/fu/man/xmlwriter).
+- Includes a custom [PostgreSQL client module](/fu/man/pg) with a high-level
+  API and flexible type configuration.
+- Includes a simple and safe [SQL query builder](/fu/man/sql).
+- Built on stable foundations, will keep working for decades.
+- It's FLOSS.
+
+## Main downsides
+
+- Simple, conventional and synchronous architecture.
+- Requires a recent version of Perl (5.36+).
+- Requires a C compiler and Perl development environment to build & install.
+- Will not work on Windows. <small>Is that even a downside?</small>
+- Does not work on 32-bit systems.
+- Doesn't have a fancy marketing page
+- Introductory documentation is lacking
+- "Suffers" from a healthy dose of [NIH](https://en.wikipedia.org/wiki/Not_invented_here).
+
+Check the [description](/fu/man#description) in the documentation for more
+information and details.
+
+## Download <a href="/fu/feed.atom"><img src="/img/feed_icon.png" alt="Atom feed"></a>
+
+Latest version
+:   0.4 (2025-03-19 - [FU-0.4.tar.gz](/download/FU-0.4.tar.gz) \-
+    [CPAN mirror](https://metacpan.org/release/FU))
+
+Development version
+:   Available on git at
+    [https://code.blicky.net/yorhel/fu](https://code.blicky.net/yorhel/fu).
+
+License
+:   MIT.