Add METADATA and NOTICE files

Test: N/A
Change-Id: I561324cb736adcb445873949e9df643b289b5adb
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..f5b57ba
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,14 @@
+name: "pigweed"
+description:
+    "Pigweed is an open source collection of embedded-targeted libraries. These "
+    "modules are building blocks and infrastructure that enable faster and more "
+    "reliable development on small-footprint MMU-less 32-bit microcontrollers."
+
+third_party {
+  url {
+    type: GIT
+    value: "https://pigweed.googlesource.com/pigweed/pigweed"
+  }
+  version: "e6d3a61088df772c71547801dd12cd48f57cec75"
+  last_upgrade_date { year: 2020 month: 8 day: 6 }
+}