[llvm] [llvm-debuginfo-analyzer][DOC] Convert 'README.txt' to markdown. (PR #86394)

[J. Ryan Stinnett via llvm-commits]

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+# llvm-debuginfo-analyzer
+
+These are the notes collected during the development, review and test.
+They describe limitations, know issues and future work.
+
+### Remove the use of macros in *LVReader.h* that describe the *bumpallocators*.
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jryans wrote:

Consider monospace / code style (ticks) instead of emphasis (asterisks) for code things like files and functions

https://github.com/llvm/llvm-project/pull/86394