added npm install instruction
added npm install instruction

Objectway/ow-grid,Objectway/ow-grid,Objectway/ow-grid,ekfuhrmann/super-gigi,ekfuhrmann/super-gigi,decore/super-gigi,decore/super-gigi,ekfuhrmann/super-gigi,Objectway/super-gigi,decore/super-gigi