Create workspace from previous implementation files

Cargo.toml

@@ -0,0 +1,22 @@
+[workspace]
+members = [
+    # Well of course, all the common/shared source code among services is going to end up somewhere:
+    "kairo-common",
+    # The intended backend application to expose a REST API:
+    "kairo-core",
+    # The intended frontend application for GUI navigation:
+    "kairo-nav",
+    # Tools and whatnots for testing or simulating other components:
+    "simulation-tools",
+    # The service doing the calculations:
+    "xyz-engine"
+]
+
+[workspace.dependencies]
+tokio = { version = "1.28.1", features = ["rt-multi-thread", "macros"] }
+dotenv = "0.15.0"
+chrono = "0.4.24"
+paho-mqtt = "0.12.1"
+serde = "1.0.162"
+serde_json = { version = "1.0.95" }
+influxdb = { version = "0.6.0", default-features = false, features = ["derive", "use-serde", "reqwest-client"] }