meta-google: drop in LICENSEs: MIT and Apache-2.0

The meta-google layer contains sources that are licensed under apache-2.0 or
if specified MIT.

Change-Id: I3871f161996d1dde6cf9e21c0ce5876524b61d80
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8c39fd2
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,12 @@
+Different components of meta-google are under different licenses (a mix
+of MIT and Apache-2.0). Please see:
+
+COPYING.Apache-2.0
+COPYING.MIT (MIT)
+
+All metadata is MIT licensed unless otherwise stated. Source code
+included in tree for individual recipes is under the LICENSE stated in
+the associated recipe (.bb file) unless otherwise stated.
+
+License information for any other files is either explicitly stated
+or defaults to Apache-2.0.