add README

README.md

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+# Alee Forth
+
+**Still very much in development! Not suitable for real applications yet.**
+
+Alee is a portable and concise Forth implementation in modern C++. Its primary aims are for reduced program size and execution efficiency. Portability includes bare-metal platforms, with intentions to support microcontrollers with kilobytes of memory.
+
+## Built-in words
+
+```
+drop dup swap pick rot >r r>
+here allot const imm @ ! : ; (
++ - * / %
+= <
+& | ^ << >>
+sys
+```
+
+The `sys` word links to a C++ function for user-defined functionality.
+
+## Building
+
+Alee requires `make` and a C++17-compatible compiler.
+
+To compile, simply run the `make` command. The resulting binary, `alee`, runs a read-eval-print loop.
+