[cmake-developers] Adding Release Notes

[Stephen Kelly]

Brad King wrote:

> Please proofread and check for your changes.
> (I'm excluding most minor/internal bug fixes.)

Done. I also have this:

 diff --git a/Help/release/3.0.rst b/Help/release/3.0.rst
 index 51b7de9..1f0f2e5 100644
 --- a/Help/release/3.0.rst
 +++ b/Help/release/3.0.rst
 @@ -77,6 +77,17 @@ Generators
 * The :generator:`Ninja` generator learned to use ``ninja`` job pools
   when specified by a new :prop_gbl:`JOB_POOLS` global property.
 
 +
 +
 +..
 +
 +  Why is PLATFORM_ID in the generators section? Other genex related
 +  changes include
 +  * Nullary $<CONFIG>
 +  * Add {UPPER,LOWER}_CASE and MAKE_C_IDENTIFIER.
 +  * EQUAL - various numeric types
 +
 +
 * New ``$<PLATFORM_ID>`` and ``$<PLATFORM_ID:...>``
   :manual:`generator expressions <cmake-generator-expressions(7)>`
   have been added.

Are they also release notes worthy?

Thanks,

Steve.