Add welcome messages

.github/FUNDING.yml

@@ -0,0 +1,13 @@
+# These are supported funding model platforms
+
+github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+custom: ["https://paypal.me/herrkaste"]

.github/workflows/lint.yml

@@ -0,0 +1,14 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  check-messages:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: kaste/upgrade-messages-test-action@v1

messages.json

@@ -0,0 +1,4 @@
+{
+    "install": "messages/install.txt",
+    "1.21.1": "messages/1.21.1.txt"
+}

messages/1.21.1.txt

@@ -0,0 +1,10 @@
+Compare Side-by-Side 1.21.x
+---------------------------
+
+Compare Side-by-Side is alive again.  If you've had a local override to make it
+work before; now it is time to delete that.  Let's see if the original package
+is working for you!
+
+The package's home has moved to   https://github.com/kaste/Compare-Side-By-Side
+
+☝️

messages/install.txt

@@ -0,0 +1,29 @@
+Compare Side-by-Side
+--------------------
+
+👋
+
+This package adds a simple side-by-side comparison tool to Sublime Text.
+
+Usage Options
+---
+
+  - Right click on a tab or within a buffer and select "Compare with..."
+    This will open up a panel listing all other open views.  Choose one
+    of them as the target (or "B" part) to compare with.
+
+    Alternatively, right click on a *tab* and select "Compare with active tab"
+
+  - You can also compare arbitrary selections.
+    Just highlight some text, right click -> "Mark selection for comparison".
+    Now, mark a second selection, then right click -> "Compare selections".
+
+    Alternatively, create two selections using the multi-cursor feature of Sublime
+    and then "Compare selections" directly.
+
+  - This plugin can be used from the command line.
+    See https://github.com/kaste/Compare-Side-By-Side/blob/master/README_COMMANDS.md
+
+  - In the comparison view you can jump from modification to modifictaion:
+    `alt+n` (as in: `n`ext) jumps forwards and `alt+p` (`p`revious) backwards.
+