Move the documentation from the old branch

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-# Elna programming language
-
-## Current implementation
-
-This repository contains a GCC frontend for Elna. After finishing the frontend
-I'm planning to rewrite the compiler in Elna itself with its own backend and
-a hand-written parser. So GCC gives a way to have a simple bootstrap compiler
-and a possbility to compile Elna programs for different platforms.
-
-## Grammar
-
-Flex and bison grammar specifications, `lexer.ll` and `parser.yy`, can be found
-in the `boot/` directory.
-
-## Build
-
-The frontend requires GCC 15.3.0 (not tested with other versions).
-
-Download the GCC source. Copy the contents of this repository into `gcc/elna`
-inside GCC. Finally build GCC enabling the frontend with
-`--enable-languages=c,c++,elna`. After the installation the compiler can be
-invoked with `$prefix/bin/gelna`.
-
-There is also a `Rakefile` that downloads, builds and installs GCC into the
-`./build/` subdirectory. The `Rakefile` assumes that ruby and rake, as well as
-all GCC dependencies are already available in the system. It works under Linux
-and Mac OS. In the latter case GCC is patched with the patches used by Homebrew
-(official GCC doesn't support Apple silicon targets). Invoke with
-
-```sh
-rake boot
-```
-
-`gcc` binary is used by default, but a different gcc version can be specified
-by passing `CC` and `CXX` environment variables to rake, e.g.:
-
-```sh
-rake CC=gcc-15 CXX=g++-15 boot
-```
-
-See `rake -T` for more tasks. The GCC source is under `build/tools`. The
-installation path is `build/host/install`.