add readme

README.md

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+# About
+This is a mod for Good Company, adding more features for courier related actions.
+
+
+# Features
+* Adds an `Add Route` button to the courier pallet that creates a new route with the selected pallet and its reserved item slots.
+
+# Installing
+1. Ensure [GCModLoader](https://github.com/SeppahBaws/GoodCompanyModLoader) is installed.
+2. Grab the `BetterCouriers.dll` from the [latest release](https://github.com/kennipj/gc-better-couriers/releases/latest), and put it in the `<GoodCompanyDir>\GCModLoader\Mods` directory.
+3. Add the mod to `<GoodCompanyDir>\GCModLoader\ModsConfig.json`.
+    ```json
+    {
+        "Name": "BetterCouriers",
+        "File": "BetterCouriers.dll",
+        "Enabled": true
+    }
+    ```