Add descr file

Author: rgrinberg

lambda-term.descr

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+Terminal manipulation library for OCaml
+
+Lambda-term is a cross-platform library for manipulating the terminal. It
+provides an abstraction for keys, mouse events, colors, as well as a set of
+widgets to write curses-like applications. The main objective of lambda-term is
+to provide a higher level functional interface to terminal manipulation than,
+for example, ncurses, by providing a native OCaml interface instead of bindings
+to a C library. Lambda-term integrates with zed to provide text edition
+facilities in console applications.