This script is based on Angela, an RLT trading LEGEND. The green line=10ema, red=20ema. The green triangle shows up when the buy signal is triggered. This script also has a BUY ZONE alert that can be setup as well.
To use, click the gray button above ^^ "Add to Favorite Scripts". Then go to your trading view "charts" screen, click on the "fx" looking icon on the tool bar and click on "Favorites" on the left. Find "The Angela" on the right side and click on it -- it should now add this indicator to your chart.