Add TODO for the following 12 months

TODO.md

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+1. Update Tutorial -- fix broken format; fix content inconsistency with existing status of Owl
+2. Inline documentation: adapt to odoc and update content -- 1.5 month 
+3. Revise examples, fix broken ones.
+4. Refactor existing Owl datasets and related code.
+5. Update docker container automatic rebuild 
+6. Fix the Float16 incompatible issue in installation with OCaml 5.2, perhaps 1-4 months 
+7. Process existing issues (not solving every one of them, but rather keep the issues up to date with existing Owl status)
+8. Fix minor problems raised in the github issues 1-2 months
+9. Add tests and fix broken ones.
+10. Publish a new version in this year 
+11. Refactor Owl-Jupyter and documentation.
+12. Plot: update documentation
+13. Adhoc tasks, including adapting to new OCaml compiler releases.