feat: add shell script to get file info json from figma api

figma_extractor/figma_extractor.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# this script is used in .travis.yml
+
+# this script is being made executable with
+# chmod ugo+x figma_extractor.sh
+
+# set flags for execution of this file:
+# -e: make sure command returns non-zero exit code as soon as somehting fails
+# set -e
+
+# During local development, we want to use the .env file. On CI, we
+# will pass these variables as options
+if [ -f .env ]
+then
+  export $(cat .env | sed 's/#.*//g' | xargs)
+fi
+
+ACCESS_TOKEN=${FIGMA_ACCESS_TOKEN}
+FILE_URL=${FIGMA_FILE_URL}
+JSON_FILENAME=${FIGMA_JSON_FILENAME}
+
+curl -sH "X-Figma-Token: $FIGMA_ACCESS_TOKEN" "$FIGMA_FILE_URL" -o $FIGMA_JSON_FILENAME