Merge pull request #2 from gqlgo/add-more-usage

Add descriptions to README more.

README.md

@@ -15,18 +15,22 @@ query GetA() {
 ## How to use
 
 A runnable linter can be created with multichecker package.
+You can create own linter with your favorite Analyzers.
 
 ```go
 package main
 
 import (
+        "github.com/gqlgo/awesomeanalyzer"            // It is an example. It does not exist actually.
         "github.com/gqlgo/gqlanalysis/multichecker"
         "github.com/gqlgo/lackid"
 )
 
 func main() {
         multichecker.Main(
+		awesomeanalyzer.Analyzer,
 		lackid.Analyzer,
+		// You can add more Analyzers!
 	)
 }
 ```
@@ -37,6 +41,21 @@ func main() {
 $ go install github.com/gqlgo/lackid/cmd/lackid@latest
 ```
 
+The `lackid` command has two flags, `schema` and `query` which will be parsed and analyzed by lackid's Analyzer.
+
+```sh
+$ lackid -schema="server/graphql/schema/**/*.graphql" -query="client/**/*.graphql"
+```
+
+The default value of `schema` is "schema/*/**.graphql" and `query` is `query/*/**.graphql`.
+
+`schema` flag accepts URL for a endpoint of GraphQL server.
+`lackid` will get schemas by an introspection query via the endpoint.
+
+```sh
+$ lackid -schema="https://example.com" -query="client/**/*.graphql"
+```
+
 <!-- links -->
 [gopkg]: https://pkg.go.dev/github.com/gqlgo/lackid
 [gopkg-badge]: https://pkg.go.dev/badge/github.com/gqlgo/lackid?status.svg