Add flags for setting config fields

[Takayuki Maeda]

I want to add the following options corresponding to Config struct fields.

frum/src/config.rs

Lines 5 to 10 in 88d2926

 pub struct FrumConfig { 
     pub base_dir: Option<PathBuf>, 
     pub ruby_build_mirror: reqwest::Url, 
     pub log_level: LogLevel, 
     pub frum_path: Option<PathBuf>, 
 } 

field name	option name	description
base_dir	--farm-dir	-
ruby_build_mirror	--ruby-build-mirror	-
log_level	--log-level	error or info or quiet. default: info

• --frum-dir
• --ruby-build-mirror
• --log-level

[Michael Kohl]

Could you elaborate a bit, which config fields, etc?

[Takayuki Maeda]

@citizen428
I added some descriptions!