ip xfrm readme.

Author: philljj

scripts/ip-xfrm/README.md

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+# IPsec ESP and ip xfrm support
+
+Some convience scripts and config for testing IPsec with wolfIP:
+
+- delete_all (delete all ip xfrm state and policies)
+- hmac_auth (set auth only state and policies)
+- show (show ip xfrm state and policies)
+- esp_sa.txt (ESP SA config to use in Wireshark)
+
+# Build
+
+## wolfssl
+
+Build wolfssl with:
+
+```sh
+./configure --enable-cryptonly --enable-sha --enable-sha256 --enable-md5
+  make
+  sudo make install
+```
+
+# wolfip
+
+Build wolfip with:
+```sh
+-DWOLFIP_ESP -DWOLFSSL_WOLFIP
+```
+