Add TODO file.

TODO

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+TODO List
+
+The gmpy2 2.1.0 release should be stable for mathematical functions available 
+to the end-user. The minimum function set should be based on MPFR 3.2 and
+MPF 1.03 but additional functions from MPFR 4.1 and MPC 1.10 should also
+be available.
+
+Functions to add/verify
+=======================
+
+MPFR related functions
+----------------------
+
+* Add mpfr_erandom and  mpfr_nrandom functions.
+
+* Add  mpfr_fmodquo function.
+
+* Add mpfr_gamma_inc functon.
+
+* Add mpfr_rint_roundeven and mpfr_roudneven functions.
+
+* Check behavior of mpfr_get_str for NaN input and the setting of the inexact
+  flag.
+
+* Check behavior of mpfr_set_exp. 
+
+MPC related functions
+---------------------
+
+* Add mpc_cmp and mpc_cmp_abs functions.
+
+* Add mpc_rootofunity function.
+
+Improve Test Suite and Documentation
+====================================
+
+More testing needs to be done.
+
+Internal Cleanup
+================
+
+The following internal changes should be done but will occur after the 2.1.0
+release.
+
+* Support the modern Python 3.2+ Unicode functions.
+
+* Support new thread local storage functions.
+
+* Support proper module initialization (??).
+
+
+
+
+