Add labels file (#21)

* Add labels file

Copied from the old matrix-org react-sdk labels (which weren't
synced from github it seems).

* Add label sync workflow

* Remove labels that are defined in element-meta

.github/labels.yml

@@ -0,0 +1,28 @@
+- name: "A-Timesheet-1"
+  description: "Log any time spent on this into the A-Timesheet-1 project"
+  color: "#5319E7"
+- name: "backport staging"
+  description: "Label to automatically backport PR to staging branch"
+  color: "#B60205"
+- name: "Dependencies"
+  description: "Pull requests that update a dependency file"
+  color: "#0366d6"
+- name: "Sponsored"
+  color: "#b506d8"
+- name: "T-Deprecation"
+  description: "A pull request that makes something deprecated"
+  color: "#98e6ae"
+- name: "X-Blocked"
+  description: "The PR cannot move forward in any capacity until an action is made"
+  color: "ff7979"
+- name: "X-Breaking-Change"
+  color: "#ff7979"
+- name: "X-Upcoming-Release-Blocker"
+  description: "This does not affect the current release cycle but will affect the next one"
+  color: "#e99695"
+- name: "Z-Community-PR"
+  description: "Issue is solved by a community member's PR"
+  color: "#ededed"
+- name: "Z-Experiment"
+  description: "Experimental PR, primarily up for its Netlify build, high likelihood of never making it beyond here."
+  color: "#b60205"