Creating a directory for the new language detector called CLD3 and adding...

Creating a directory for the new language detector called CLD3 and adding OWNERS, LICENSE, and README.chromium files.

BUG=

Review-Url: https://codereview.chromium.org/2110083003
Cr-Commit-Position: refs/heads/master@{#406137}

third_party/cld_3/OWNERS

+andrewhayden@chromium.org
+abakalov@chromium.org
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third_party/cld_3/README.chromium

+Name: Compact Language Detector v3
+Short Name: cld_3
+URL: https://github.com/google/cld3
+Version: 0
+License: Apache 2.0
+Security Critical: yes
+
+Description:
+CLD3 is a neural net model for detecting the language of text.
+
+Local Modifications:
+None.
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