Added README.chromium

Change-Id: I7dd56ba0f8a599773739081e785349c6690d7a40

README.chromium

diff --git a/README.chromium b/README.chromium
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+Name: Perfetto
+URL: https://android.googlesource.com/platform/external/perfetto/
+Version: unknown
+License: Apache2
+License File: MODULE_LICENSE_APACHE2
+Security Critical: yes
+License Android Compatible: yes
+Description: Performance instrumentation and logging for Google client platforms
+Local Modifications: None