chore: add .github/opencollective.yml

Author: open-collective-bot[bot]

.github/opencollective.yml

@@ -0,0 +1,77 @@
+# Collective
+# ----------
+
+# Define the Open Collective you want to link the repository with.
+# Please use the Open Collective slug not the Open Collective URL.
+
+collective: <YOUR-COLLECTIVE-SLUG>
+
+# Examples
+
+# collective: webpack
+
+# Invalid examples
+
+# collective: https://opencollective.com/webpack
+# collective: opencollective.com/webpack
+# collective: https://opencollective.com/webpack/contribute/backer-266
+
+# Invitation
+# ----------
+
+# Post a comment on issues created by non contributors.
+
+invitation: |-
+  Hey <author> :wave:,
+
+  Thank you for opening an issue. We will get back to you as soon as we can. Also, check out our Open Collective and consider contributing financially.
+
+  <link>
+
+  > PS.: We offer `priority` support for all financial contributors. Don't forget to add `priority` label once you start contributing :smile:
+
+# To disable that feature, you can use the following syntax
+
+# invitation: false
+
+# Tiers
+# -----
+
+# In this section you can define specific behavior for all supported tiers, ie: "backer" "and sponsor".
+
+tiers:
+  # # Uncomment this block if you want to activate a custom comment for people contributors to the "backer" tier
+  # - tiers: ['backer']
+  #   labels: ['priority']
+  #   message: |-
+  #     Hey <author> :wave:,
+  #
+  #     Thank you for being a "backer". We will handle your issue with priority support. To make sure we don't forget how special you are, we added a `priority` label to your issue.
+  #
+  #     Thank you again for contributing :tada:!
+
+  # # Uncomment this block if you want to activate a custom commentfor people contributors to the "sponsor" tier
+  # - tiers: ['sponsor']
+  #   labels: ['priority']
+  #   message: |-
+  #     Hey <author> :wave:,
+  #
+  #     Thank you for being a "sponsor".  We will handle your issue with priority support. To make sure we don't forget how special you are, we added a `priority` label to your issue.
+  #
+  #     Thank you again for contributing :tada:!
+
+  # This rule will be catching any contributor whatever their tiers (also custom contributions)
+  - tiers: '*'
+    labels: ['priority']
+    message: |-
+      Hey <author> :wave:,
+
+      Thank you for contributing to our project financially. We will handle your issue with priority support. To make sure we don't forget how special you are, we added a `priority` label to your issue.
+
+      Thank you again for contributing :tada:!
+
+# To disable that feature, you can use the following syntax
+
+# tiers: []
+
+