Add yarn fix command

lizhizhou · lizhizhou · commit c5e56defcd9f · 2018-08-22T18:08:54.000+08:00
diff --git a/README.md b/README.md
@@ -1,2 +1,7 @@
 # machinelearning
 Machine learning library for OpenFPGAduino
+
+For yarn watch error in linux run
+
+echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p 
+
