Add section in README on CLI commands
Add section in README on CLI commands

`lotus server` and `lotus console` were added in
https://github.com/lotus/lotus/commit/f342c2095f79e2c3d354c87b0d3e427eb7c23546 and
https://github.com/lotus/lotus/commit/c5f38376c4e1bc822a29d96005f42bd6f970db25
respectively but are not documented in the README.

This adds a short description of the commands to the README as well as
documenting what the command assumes to be in place.

deepj/lotus,fewtaeyeon/hanami,ferdinandrosario/lotus,rpanachi/lotus,gfvcastro/lotus,hieuk09/lotus,cllns/hanami,AlfonsoUceda/lotus,benlovell/lotus,t4deu/lotus,fewtaeyeon/hanami,benlovell/lotus,maxprig/lotus,fewtaeyeon/hanami,caius/lotus,supriyantomaftuh/lotus,lucasallan/lotus,simi/lotus,brennovich/lotus,arteezy/lotus,deerawan/lotus,simi/lotus,theocodes/lotus,0x73/lotus,lucasallan/lotus,cllns/hanami,brennovich/lotus,0x73/lotus,vinhnglx/lotus,lotus/lotus,nguyenngoc2505/lotus,kidaa/lotus,deepj/lotus,AlfonsoUceda/lotus,smt116/lotus,yamadagenki/lotus,mymai91/lotus-practice-aug824,Klaudit/lotus,mli-max/lotus,smt116/lotus,rpanachi/lotus,benlovell/lotus,lotus/lotus,mymai91/lotus-practice-aug824,caius/lotus,maxprig/lotus,lucasallan/lotus,deerawan/lotus,vinhnglx/lotus,nguyenngoc2505/lotus,gfvcastro/lotus,mvader/lotus,jenalgit/lotus,arteezy/lotus,AlfonsoUceda/lotus,gfvcastro/lotus,supriyantomaftuh/lotus,t4deu/lotus,kidaa/lotus,yamadagenki/lotus,ferdinandrosario/lotus,hanami/hanami,jenalgit/lotus,hieuk09/lotus,mvader/lotus,lotus/lotus,Klaudit/lotus,mli-max/lotus,cllns/hanami,hanami/hanami,theocodes/lotus