[docs] add documentation for using Verilog import
[docs] add documentation for using Verilog import

cornell-brg/pymtl,cfelton/pymtl,jjffryan/pymtl,jck/pymtl,12yujim/pymtl,Glyfina-Fernando/pymtl,tj93/pymtl,Glyfina-Fernando/pymtl,jjffryan/pymtl,jjffryan/pymtl,tj93/pymtl,cfelton/pymtl,cornell-brg/pymtl,jck/pymtl,12yujim/pymtl,jck/pymtl,Glyfina-Fernando/pymtl,tj93/pymtl,cfelton/pymtl,12yujim/pymtl,cornell-brg/pymtl