document profile support

spec/ext/GRBC_EXT_profiles.md

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+# GRBC_EXT_profiles
+compiler profile support in grbc
+
+## About
+Author: Interfiber
+Release Date: 9/29/24
+
+## Example
+```lua
+-- Load extension, by default the debug profile is selected
+grbc_ext("GRBC_EXT_profiles")
+
+-- Set the profile, make sure this is at the top of the file!
+-- See below for default profiles
+grbc_set_profile("debug")
+
+
+```
+
+## Profiles
+For more detailed information see ```src/ext_profiles.cc```
+
+### debug
+Standard debug profile, ```-O1```, and debug symbol generation
+
+### release_with_debug_symbols
+Release build but with debug symbol generation, uses ```-O3```
+
+## release
+Release build with ```-O3```
+