add a STATUS file to keep track of implementation progress

STATUS

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+This file describes the implementation status and some notes; information is
+taken from the C99 standard (ISO/IEC 9899:1999), section 7 ("Library").
+
+Notes for implementers:
+
+7.1.2§6:
+  Use (extern) in all function prototypes
+7.1.3§1:
+  Only expose standard identifiers; anything else might be defined as a macro.
+  Make sure every argument name, internal function name, etc. starts with
+  either "__" or "_X" (where X is any uppercase letter)
+7.1.4§1:
+  Always give a function even if there is a macro definition, so that the
+  address of the function can be taken; don't rely on the macro being defined,
+  as the user can remove it except in some special cases
+
+In this file, every definition is classified in one of several implementation
+statuses. There are 5 stages that every definition should go through.
+
+TODO:       Function/symbol/macro is not implemented/defined
+BDEPS(...): Function/symbol/macro needs ... to build
+LDEPS(...): Function/symbol/macro needs ... to link
+TEST:       Function/symbol/macro needs to be tested
+DONE:       Function/symbol/macro is defined, builds, links, and is tested
+
+7.2 <assert.h>
+    7.2.1 assert: LDEPS(fprintf,stderr,abort)
+
+7.3 <complex.h>
+    Provided by Lephenixnoir's port of OpenLibm.
+    TODO: Check standard compliance
+
+7.4 <ctype.h>
+    7.4.1 is*: TEST
+    7.4.2 to*: TEST
+
+7.5 <errno.h>
+    7.5.2 EDOM EILSEQ ERANGE: DONE
+
+7.6 <fenv.h>
+    Provided by Lephenixnoir's port of OpenLibm.
+    TODO: Check standard compliance
+
+7.7 <float.h>
+    Provided by GCC.
+
+7.8 <inttypes.h>
+    7.8.1   Macros for printing: TODO
+    7.8.2.1 imaxabs: TODO
+    7.8.2.2 imaxdiv: TODO
+    7.8.2.3 strotimax strtoumax: TODO
+    7.8.2.4 wcstoimax wcstoumax: TODO
+
+7.9 <iso646.h>
+    Provided by GCC.
+
+7.10 <limits.h>
+     Provided by GCC.
+
+7.11 <locale.h>
+     7.11.1 setlocale: TEST
+     7.11.2 localeconv: TEST
+
+     What if we wanted to support more locales?
+     -> Need to a mechanism to supply the raw information, similar to the text
+        files in /usr/share/i18n/locales
+     -> Implement setlocale() and localeconv() properly (not hard)
+     -> Probably support nl_langinfo(), which is much better than localeconv()
+
+7.12 <math.h>
+     Provided by Lephenixnoir's port of OpenLibm.
+     TODO: Check standard compliance
+
+7.13 <setjmp.h>
+     7.13.1 setjmp: TEST
+     7.13.2 longjmp: TEST
+
+7.14 <signal.h>
+     TODO: Difficult; the execution environment might not support signals
+
+7.15 <stdarg.h>
+     Provided by GCC.
+
+7.16 <stdbool.h>
+     Provided by GCC.
+
+7.17 <stddef.h>
+     Provided by GCC.
+
+7.18 <stdint.h>
+     Provided by GCC.
+
+7.19 <stdio.h>
+     TODO (will give the full list later on)
+
+7.20 <stdlib.h>
+     TODO (will give the full list later on)
+
+7.21 <string.h>
+     TODO (will give the full list later on)
+
+7.22 <tgmath.h>
+     Provided by GCC.
+
+7.23 <time.h>
+     TODO (will give the full list later on)
+
+7.24 <wchar.h>
+     TODO (not a priority)
+
+7.25 <wctype.h>
+     TODO (not a priority)