Add METADATA to base: contains EPL=RECIPROCAL

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes
Change-Id: I859cb4a02bf278dec9a31cac1efb2ce5cb05fa20
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..5c3f89c
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,3 @@
+third_party {
+  license_type: RECIPROCAL
+}