forgot the new CMakelists.txt under eth directory

Author: Super-Genius

src/eth/CMakeLists.txt

@@ -0,0 +1,23 @@
+# eth peer discovery library
+add_library(eth OBJECT
+        ${CMAKE_CURRENT_LIST_DIR}/messages.cpp
+        ${CMAKE_CURRENT_LIST_DIR}/objects.cpp
+        ${CMAKE_CURRENT_LIST_DIR}/event_filter.cpp
+        ${CMAKE_CURRENT_LIST_DIR}/abi_decoder.cpp
+        ${CMAKE_CURRENT_LIST_DIR}/chain_tracker.cpp
+        ${CMAKE_CURRENT_LIST_DIR}/eth_watch_service.cpp
+)
+
+target_include_directories(eth PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../../include>
+        $<INSTALL_INTERFACE:include>
+        $<BUILD_INTERFACE:${crypto3_INCLUDE_DIR}>
+)
+
+# Install headers
+install(DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/../../include/eth/
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/eth
+        FILES_MATCHING PATTERN "*.hpp"
+)
+
+