diff --git a/lib/Catch2 b/lib/Catch2
new file mode 160000
index 0000000000000000000000000000000000000000..d63307279412de3870cf97cc6802bae8ab36089e
--- /dev/null
+++ b/lib/Catch2
@@ -0,0 +1 @@
+Subproject commit d63307279412de3870cf97cc6802bae8ab36089e
diff --git a/lib/etl b/lib/etl
new file mode 160000
index 0000000000000000000000000000000000000000..d6a90179f46501a8f4835d7c8fe0151aebc88130
--- /dev/null
+++ b/lib/etl
@@ -0,0 +1 @@
+Subproject commit d6a90179f46501a8f4835d7c8fe0151aebc88130
diff --git a/lib/logger b/lib/logger
new file mode 160000
index 0000000000000000000000000000000000000000..a5e4d9c93f3c08c67c06f25c2ef5cc2054d79ad7
--- /dev/null
+++ b/lib/logger
@@ -0,0 +1 @@
+Subproject commit a5e4d9c93f3c08c67c06f25c2ef5cc2054d79ad7