Add simple single line comments

services/parser/src/pipeline.pest

@@ -35,4 +35,4 @@ STRV = @{ "''" | (!"'" ~ ANY)* }
 COMMA = @{ "," }
 
 WHITESPACE = _{ (" " | NEWLINE) }
-COMMENT = _{ "#" }
+COMMENT = _{ "//" ~ (!NEWLINE ~ ANY)* }

services/parser/test_data/valid/00_simple.otto

@@ -1,3 +1,5 @@
+// This is a very simple pipeline
+
 pipeline {
     stage {
         name = 'Build'

services/parser/test_data/valid/92_orphan_steps_and_stages.otto

@@ -0,0 +1,16 @@
+pipeline {
+    steps {
+        sh 'ls'
+    }
+
+    stage {
+        name = 'Package'
+        steps {
+            sh './scripts/package.sh'
+        }
+    }
+
+    steps {
+        echo 'Play me off, keyboard cat!'
+    }
+}