Add instructions for installing linter

Makefile

@@ -3,7 +3,7 @@ GO_BUILD_DIR?=build/
 ldflags := -X 'github.com/livepeer/catalyst-api/config.Version=$(shell git rev-parse HEAD)'
 
 .PHONY: all
-all: build fmt test
+all: build fmt test lint
 
 .PHONY: build
 build:
@@ -13,6 +13,10 @@ build:
 fmt:
 	go fmt ./...
 
+.PHONY: lint
+lint:
+	golangci-lint run
+
 .PHONY: run
 run:
 	go run cmd/http-server.go

README.md

@@ -2,6 +2,10 @@
 
 An HTTP API to allow services (e.g Livepeer Studio) to interact with Catalyst.
 
+## Prerequisites
+
+The default Makefile goal and the CI process for this repo uses `golangci-lint` for linting. To install, follow the instructions at https://golangci-lint.run/usage/install/#local-installation
+
 ## Development
 
 To test the [Catalyst](http://github.com/livepeer/catalyst) integration, follow the instructions in that repo to run a local Catalyst instance and then:
@@ -18,4 +22,4 @@ By default, this runs on a different port (`4949`) to the Catalyst one (`7979`)
 curl 'http://localhost:4949/ok'
 ```
 
-If you see a response body of `OK` then things are working and you can begin using this instance to test the API's integration with Mist and the other parts of the Catalyst system.
+If you see a response body of `OK` then things are working and you can begin using this instance to test the API's integration with Mist and the other parts of the Catalyst system.