Write a guide that explains and simplifies connecting to our testnets

[adrianbrink]

Currently connecting to the testnets requires you to follow a specific blog posts.

There needs to be documentation (see #225 for more information on docs) that explains how to connect to the testnets.

Furthermore, it should be very quick and simple to connect to the testnets after having installed ethermint. There should be cli commands and flags that automatically connect you to a certain public ethermint network.

• Test it with 2 users that have never used ethermint or venus and just watch them follow the guide. Then update accordingly

[adrianbrink]

@odeke-em What do you think about extending the CLI to actually cover the use case of connecting to one of our testnets?

[odeke-em]

SGTM! I can take a look at this when I get up, thanks.

[zramsay]

just a thought: ethermint init could have a flag --testnets that generates the required files. tendermint init could have the same feature, so we can skip the git clone the-testnets-repo and cp sequence. would be an extension of #245

[adrianbrink]

The idea is that we hardcode the genesis files for tendermint validators and ethermint into the binary. When you then specify ethermint start --testnet --home ... ethermint initialises with the testnet genesis file and overrides the genesis file for tendermint.

Let's also consider that we start tendermint automatically in the background by using https://golang.org/pkg/os/exec/ to issue tendermint init --home and tendermint node.

[odeke-em]

@adrianbrink the tricky thing that am thinking about doing #179 (comment) is that what if the user doesn't want to reinit tendermint?
A solution to that is to add an opt-out flag say --no-tendermint which will be documented to opt out of invoking tendermint init when ethermint init is invoked and tendermint node when ethermint is invoked. I think the new cosmos-ui by @mappum et all currently invokes both baseserver and tendermint

[adrianbrink]

The flag should be --without-tendermint to be consistent with the rest of the apps.

[zramsay]

the original issue is merged