Adds a resolution acknowledging UTC.

We use UTC for timekeeping, let's acknowledge that.

Change-Id: I79aa1f08de57526c7626c34e30d08fa4102ec744
Co-Authored-By: Doug Hellmann <doug@doughellmann.com>

resolutions/20150512-utc.rst

@@ -0,0 +1,6 @@
+===================================
+2015-05-12 Acknowledging use of UTC
+===================================
+
+We use UTC for specifying dates and times related to activities overseen by
+the TC, such as events with deadlines (elections) or specific times (meetings).

resolutions/index.rst

@@ -5,6 +5,15 @@
 When a motion does not result in a change in a reference doc, it can
 be expressed as a resolution.
 
+2015
+====
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   2015*
+
 2014
 ====