eliuds-eggs: Add instructions append (#731)

Author: tasxatzial

exercises/practice/eliuds-eggs/.docs/instructions.append.md

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+# Instructions append
+
+## Appendix
+
+~~~~exercism/note
+The instructions above are synchronized with a shared repository to ensure consistency across all language tracks.
+This appendix provides additional clarification or modifies the instructions as needed to better align with the goals of the Clojure track.
+~~~~
+
+It is important not to use existing built-in functions with similar functionality to the function are implementing, as doing so would diminish the intended learning value of the exercise.
+In Clojure, there is no built-in function to count the number of bits in a number, so you may use any Clojure function in your implementation.
+However, Java does include a function for this purpose: `bitCount`.