doc: Add initial README file for Haiku. [skip ci]

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+# Compiling tcpdump on Haiku
+
+## 64-bit x86 R1/beta4
+
+* Both system and local libpcap are suitable.
+* Autoconf 2.71 works.
+* CMake 3.24.2 works.
+* GCC 11.2.0 works.
+* Clang 12.0.1 works only if using the system libpcap and Autoconf.
+
+The following command will install respective non-default packages:
+```
+pkgman install libpcap_devel cmake llvm12_clang
+```
+
+For reference, the tests were done using a system installed from
+`haiku-r1beta4-x86_64-anyboot.iso`.