docs: add language overview

docs/LANGUAGES.md

@@ -0,0 +1,32 @@
+# Programming Languages in MINIX
+
+This repository contains several languages used for the operating system and associated tools.
+
+## C
+- The bulk of MINIX is written in C.
+- Code is generally built with GCC 4.8.5 or Clang 3.4.
+- Most of the system follows ISO C99. Some toolchain components limit themselves to C89 for portability.
+
+## C++
+- A limited amount of C++ exists, primarily in external packages.
+- Supported with GCC 4.8.5 (including libstdc++ and g++) and Clang 3.4.
+- C++11 features are available.
+
+## Assembly
+- Assembly sources use the GNU assembler syntax.
+- These files are compiled as part of the normal build through GCC or clang.
+
+## Go
+- LLVM bindings include Go code.
+- Requires a Go compiler at least version 1.2.
+
+## Python
+- Some build scripts and tests use Python 2.7 or newer.
+- Python 3 is also supported by parts of the tree.
+
+## AWK
+- Several utilities rely on POSIX AWK scripts.
+
+## Shell
+- Numerous build scripts use the POSIX shell.
+