Add basic README for libelfunwind

libelfunwind/README.md

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+# libelfunwind
+
+Reproduces the interface of libunwind, and exports a `libunwind.so` binary, so
+that changing `LD_LIBRARY_PATH` makes it possible to use `dwarf-assembly`
+instead of `dwarf` as an unwinding process in eg. `perf`.
+
+## `perf` currently used libunwind features
+
+```
+  # Types
+  unw_accessors_t
+  unw_word_t
+  unw_regnum_t
+  unw_proc_info_t
+  unw_fpreg_t
+  unw_dyn_info_t
+  unw_addr_space_t
+  unw_cursor_t
+
+  # Functions
+  unw_create_addr_space
+  unw_destroy_addr_space
+  unw_flush_cache
+  unw_get_reg
+  unw_init_remote
+  unw_is_signal_frame
+  unw_set_caching_policy
+  unw_step
+```