Add in enum34 1.1.6 (58c4cd7)

This is a mercurial repo, d/led zip of src:
https://bitbucket.org/stoneleaf/enum34/get/1.1.6.zip

Also added in misc files (Android.bp, METADATA, NOTICE, etc)
And add myself and guangzhu to OWNERS.

Exempt-From-Owner-Approval:

Bug: 122778810
Test: None
Change-Id: I2dd62b9938f154fbe425da0475988ed1b99e6707
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..100de17
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,16 @@
+name: "enum34"
+description:
+    "The enum module from Python3.4 backported from 3.3 - 2.4"
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://pypi.org/project/enum34/"
+  }
+  url {
+    type: HG
+    value: "https://bitbucket.org/stoneleaf/enum34/src/default/"
+  }
+  version: "1.1.6"
+  last_upgrade_date { year: 2019 month: 5 day: 2 }
+}