feat: add liner integration

lib/linear.rb

@@ -0,0 +1,39 @@
+require 'graphlient'
+
+class Linear
+  BASE_URL = 'https://api.linear.app/graphql'.freeze
+
+  def initialize(api_key)
+    @api_key = api_key
+    raise ArgumentError, 'Missing Credentials' if @api_key.blank?
+
+    @client = Graphlient::Client.new(
+      BASE_URL,
+      headers: {
+        'Authorization' => @api_key,
+        'Content-Type' => 'application/json'
+      }
+    )
+  end
+
+  def list_issues
+    query = <<~GRAPHQL
+      query {
+        issues(first: 5) {
+          nodes {
+            id
+            title
+          }
+        }
+      }
+    GRAPHQL
+
+    begin
+      response = @client.query(query)
+      response.data.issues.nodes
+    rescue StandardError => e
+      # return error message
+      e.message
+    end
+  end
+end