Add good-first-issue label (#38)

* Add `good-first-issue` label

Adding `C2-good-first-issue` to indicate that a task is good for newcomers.

* add color

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Co-authored-by: Joyce Siqueira <98593770+the-right-joyce@users.noreply.github.com>

ruled_labels/specs_polkadot-sdk.yaml

@@ -38,6 +38,9 @@ labels:
   - name: C1-mentor
     description: A task where a mentor is available. Please indicate in the issue who the mentor could be.
     color: "5319e7"
+  - name: C2-good-first-issue
+    description: A task for a first time contributor to become familiar with the Polkadot-SDK.
+    color: 7CB9E8
   - name: D0-easy
     description: Can be fixed primarily by duplicating and adapting code by an intermediate coder.
     color: eeeeee
@@ -157,4 +160,4 @@ rules:
     tags:
     spec:
       when: !some_of [A1]
-      require: !all_of [R0]
+      require: !all_of [R0]