Solve PDE for Diffusion model

Please support me about solving PDE for diffusion model. I have read pde solver from MATLAB help. I's quite new user for MATLAB. The equation as shown below.

(du/dt) = (D/r^2)*(d/dr(r^2du/dr))

R = 0.0015 D = 6.19E-08

initial condition u(r,0) = 0.13

boundary condition (du/dr) at r = 0,t = 0; u(r=R,t) = 0.005

Thank you for your kind support this problem

Best Regards, Nithi