chore: add funding.json (fundingjson.org v1.1.0)

Closes #608

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tobixen

CHANGELOG.md

@@ -30,6 +30,7 @@ This project should adhere to [Semantic Versioning](https://semver.org/spec/v2.0
 
 ### Housekeeping
 
+* Added `funding.json` (https://fundingjson.org/) at the repository root.  Closes https://github.com/python-caldav/caldav/issues/608
 * Code quality: reduced ruff ignore list (https://github.com/python-caldav/caldav/issues/634) — removed unused imports (`copy`, `lxml.etree`, `CalendarSet`, `cdav/dav` re-exports, `Optional`, `timezone`, `Event`/`Todo` type stubs), replaced bare `except:` clauses with specific exception types (`KeyError`, `AttributeError`, `Exception` where broad catching is intentional), and removed unused local variables.
 * Sync `_put()` now updates `self.url` from the `Location` header on a 302 redirect, mirroring the existing async behaviour.
 

funding.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://fundingjson.org/schema/v1.1.0.json",
+  "version": "v1.1.0",
+  "entity": {
+    "type": "individual",
+    "role": "owner",
+    "name": "Tobias Brox",
+    "email": "funding@plann.no",
+    "description": "Independent open source developer maintaining python-caldav (a CalDAV client library used by Home Assistant and many other projects) and plann (a CalDAV-based CLI for task and calendar management). Funding helps prioritise features and fixes requested by donors.",
+    "webpageUrl": {
+      "url": "https://plann.no"
+    }
+  },
+  "funding": {
+    "channels": [
+      {
+        "guid": "github-sponsors",
+        "type": "payment-provider",
+        "address": "https://github.com/sponsors/tobixen",
+        "description": "GitHub Sponsors"
+      },
+      {
+        "guid": "bank-iban",
+        "type": "bank",
+        "address": "DE90100110012753397999"
+      },
+      {
+        "guid": "btc",
+        "type": "other",
+        "address": "bc1qd63vwz0v77r5us4c8kn4l9mx9cw9pgjd47mlf9",
+        "description": "Bitcoin"
+      }
+    ],
+    "plans": [
+      {
+        "guid": "general",
+        "status": "active",
+        "name": "General support",
+        "description": "Any contribution is welcome. Funding helps prioritise features and fixes requested by donors.",
+        "amount": 0,
+        "currency": "EUR",
+        "frequency": "monthly",
+        "channels": ["github-sponsors", "bank-iban", "btc"]
+      }
+    ]
+  }
+}