For start using this package add lines into ./Packages/manifest.json like next sample:
{
"dependencies": {
"astar.action-grid": "https://github.com/k0dep/astar.action-grid.git#0.1.0"
}
}Instead #0.1.0 paste version what you need.
2018.3 After include dependency in manifest, you must manual add astar dependency in manifest