Adding generate_bindgen_rs.sh and Readme

Author: brianjjones

tensorflow-sys-runtime/README.md

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+# tensorflow-sys-runtime [![Version][version-icon]][version-page]
+
+The crate provides runtime bindings to [TensorFlow][tensorflow]. Using runtime bindings allows you to avoid
+pulling in additional package dependencies into your project. Users will need to call tensorflow::library::load()
+before any other calls so that the linking is completed before use.
+
+## NOTE
+This crate is meant to be used by [Rust language bindings for Tensorflow][crates-tf]. It is not meant to be used on it's own.
+
+## Requirements
+
+To use these bindings you must have the Tensorflow C libraries installed. See  [install steps][tensorflow-setup]
+for detailed instructions.
+
+[tensorflow]: https://www.tensorflow.org
+[tensorflow-setup]: https://www.tensorflow.org/install/lang_c
+[crates-tf]: https://crates.io/crates/tensorflow
+[version-icon]: https://img.shields.io/crates/v/tensorflow-sys-runtime.svg
+[version-page]: https://crates.io/crates/tensorflow-sys-runtime

tensorflow-sys-runtime/generate_bindgen_rs.sh

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+#!/bin/sh
+
+if ! which bindgen > /dev/null; then
+    echo "ERROR: Please install 'bindgen' using cargo:"
+    echo "    cargo install bindgen"
+    echo "See https://github.com/servo/rust-bindgen for more information."
+    exit 1
+fi
+
+include_dir="$HOME/git/tensorflow"
+
+bindgen_options_runtime_functions="--allowlist-function TF_.+ --blocklist-type .+ --size_t-is-usize --default-enum-style=rust --generate-inline-functions"
+cmd="bindgen ${bindgen_options_runtime_functions} ${include_dir}/tensorflow/c/c_api.h --output src/runtime_linking/c_api.rs --  -I ${include_dir}"
+echo ${cmd}
+${cmd}
+
+bindgen_options_runtime_types="--allowlist-type TF_.+ --blocklist-function .+ --size_t-is-usize --default-enum-style=rust --generate-inline-functions"
+cmd="bindgen ${bindgen_options_runtime_types} ${include_dir}/tensorflow/c/c_api.h --output src/runtime_linking/types.rs --  -I ${include_dir}"
+echo ${cmd}
+${cmd}
+
+echo "link! {\n$(cat src/runtime_linking/c_api.rs)" > src/runtime_linking/c_api.rs
+echo } >> src/runtime_linking/c_api.rs