Adding placeholder README file.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

AUTHORS

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+# This is the list of GlobalFoundries PDK's significant contributors.
+#
+# This does not necessarily list everyone who has contributed code,
+# especially since many employees of one corporation may be contributing.
+# To see the full list of contributors, see the revision history in
+# source control.
+
+# Companies
+Google LLC
+GlobalFoundries
+Efabless Corporation
+Mabrains LLC
+
+# Individuals
+tansell@google.com, me@mith.ro (Tim 'mithro' Ansell)
+proppy@google.com (Johan 'proppy' Euphrosine)
+tim@efabless.com (Tim Edwards)
+mkk@efabless.com (Mohamed Kassem)
+stefan.schippers@gmail.com (Stefan Schippers)
+amro_tork@mabrains.com (Amro Tork)
+farag_agoor@mabrains.com (Farag Agoor)
+mohanad_mohamed@mabrains.com (Mohanad Mohammed)

README.rst

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+GlobalFoundries 180um SRAM build space
+======================================
+
+This repository will contain a set of cells and documentation for creating advanced SRAM for `GF180MCU process technology release by Google and GlobalFoundries <https://github.com/google/gf180mcu>`_. This is frequently called an SRAM “build space”.
+
+License
+=======
+
+This repository is released under the Apache 2.0 license. The full
+license text can be found in the `LICENSE <LICENSE>`_ file.
+
+::
+
+   Copyright 2022 GlobalFoundries PDK Authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License