initial commit, add bitget rest api and websockets connector

.gitignore

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+!.gitkeep
+.DS_STORE
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+pids
+*.pid
+*.seed
+*.pid.lock
+node_modules/
+.npm
+.eslintcache
+.node_repl_history
+*.tgz
+.yarn-integrity
+.env
+.env.test
+.cache
+lib
+bundleReport.html
+.history/