  We report the phase diagram of Nd$_{1-x}$Sr$_x$NiO$_2$ infinite layer thin
films grown on SrTiO$_3$. A superconducting dome spanning $0.125 < x < 0.25$ is
found, remarkably similar to cuprates, albeit over a narrower doping window.
However, while cuprate superconductivity is bounded by an insulator for
underdoping and a metal for overdoping, here we observe weakly insulating
behavior on either side of the dome. Furthermore, the normal state Hall
coefficient is always small and proximate to a continuous zero crossing in
doping and in temperature, in contrast to the $\sim 1/x$ dependence observed
for cuprates. This suggests the presence of both electron- and hole-like bands,
consistent with band structure calculations.
