Pre push hook script

Add git_hook folder, and pre-push script,
to be soft linked from .git/hooks/pre-push

git_hooks/README.md

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+README for git hooks script
+===========================
+git has a way to run scripts, which are invoked by specific git commands.
+The git hooks are located in `<mbed TLS root>/.git/hooks`, and as such are not under version control
+for more information, see the [git documentation](https://git-scm.com/docs/githooks).
+
+The mbed TLS git hooks are located in `<mbed TLS root>/git_hooks` directory, and one must create a soft link from `<mbed TLS root>/.git/hooks` to `<mbed TLS root>/git_hooks`, in order to make the hook scripts successfully work.
+
+Example:
+
+Execute the following command to create a link on linux from the mbed TLS `.git\hooks` directory:  
+`ln -s ../../git_hooks/pre-push pre-push`
+
+Similarly, on Windows while running as administrator:  
+`mklink pre-push ..\..\git_hooks\pre-push`
+

git_hooks/pre-push

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+#!/bin/sh
+
+# Called by "git push" after it has checked the remote status, but before anything has been
+# pushed.  If this script exits with a non-zero status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local sha1> <remote ref> <remote sha1>
+#
+set -eu
+
+REMOTE="$1"
+URL="$2"
+
+echo "REMOTE is $REMOTE"
+echo "URL is $URL"
+
+run_test()
+{
+    TEST=$1
+    echo "running '$TEST'"
+    if ! `$TEST > /dev/null 2>&1`; then
+        echo "test '$TEST' failed"
+        return 1
+    fi
+}
+
+run_test ./tests/scripts/check-doxy-blocks.pl
+run_test ./tests/scripts/check-names.sh
+run_test ./tests/scripts/check-generated-files.sh