Add birdwatching checklist

BIRDWATCHING_CHECKLIST.md

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+# Birdwatching Checklist
+
+A simple checklist for tracking birds you've spotted. Check off each bird as
+you observe it, and feel free to add your own local species!
+
+## Backyard & Garden Birds
+
+- [ ] American Robin
+- [ ] Northern Cardinal
+- [ ] Blue Jay
+- [ ] House Sparrow
+- [ ] European Starling
+- [ ] Mourning Dove
+- [ ] Black-capped Chickadee
+- [ ] American Goldfinch
+- [ ] Dark-eyed Junco
+- [ ] House Finch
+
+## Woodpeckers
+
+- [ ] Downy Woodpecker
+- [ ] Hairy Woodpecker
+- [ ] Red-bellied Woodpecker
+- [ ] Northern Flicker
+- [ ] Pileated Woodpecker
+
+## Birds of Prey
+
+- [ ] Red-tailed Hawk
+- [ ] Cooper's Hawk
+- [ ] American Kestrel
+- [ ] Bald Eagle
+- [ ] Great Horned Owl
+- [ ] Barred Owl
+
+## Waterfowl & Wading Birds
+
+- [ ] Mallard
+- [ ] Canada Goose
+- [ ] Great Blue Heron
+- [ ] Great Egret
+- [ ] Belted Kingfisher
+- [ ] Wood Duck
+
+## Songbirds
+
+- [ ] Song Sparrow
+- [ ] American Crow
+- [ ] Common Grackle
+- [ ] Eastern Bluebird
+- [ ] Cedar Waxwing
+- [ ] Barn Swallow
+- [ ] Ruby-throated Hummingbird
+
+## Notes
+
+| Date | Location | Species | Notes |
+| ---- | -------- | ------- | ----- |
+|      |          |         |       |
+|      |          |         |       |
+|      |          |         |       |
+
+Happy birding! 🐦