🤖 Add labels append file (exercism#55)

The `.appends/.github/labels.yml` file contains all the labels that are currently used in this repo. The `.github/labels.yml` file will contain the full list of labels that this repo can use, which will be a combination of the `.appends/.github/labels.yml` file and a centrally-managed `labels.yml` file. We'll automatically sync any changes, which allows us to guarantee that all the track repositories will have a pre-determined set of labels, augmented with any custom labels defined in the `.appends/.github/labels.yml` file.

.appends/.github/labels.yml

@@ -0,0 +1,44 @@
+- name: "bug"
+  description: "Something isn't working"
+  color: "d73a4a"
+
+- name: "dependencies"
+  description: "Pull requests that update a dependency file"
+  color: "0366d6"
+
+- name: "documentation"
+  description: "Improvements or additions to documentation"
+  color: "0075ca"
+
+- name: "duplicate"
+  description: "This issue or pull request already exists"
+  color: "cfd3d7"
+
+- name: "enhancement"
+  description: "New feature or request"
+  color: "a2eeef"
+
+- name: "good first issue"
+  description: "Good for newcomers"
+  color: "7057ff"
+
+- name: "help wanted"
+  description: "Extra attention is needed"
+  color: "008672"
+
+- name: "invalid"
+  description: "This doesn't seem right"
+  color: "e4e669"
+
+- name: "question"
+  description: "Further information is requested"
+  color: "d876e3"
+
+- name: "v3-migration 🤖"
+  description: "Preparing for Exercism v3"
+  color: "E99695"
+
+- name: "wontfix"
+  description: "This will not be worked on"
+  color: "ffffff"
+