added build instructions

BUILD.md

@@ -0,0 +1,32 @@
+# Build
+## Instructions
+1. Add a file named `auth.json` inside the `config` folder. This file will 
+contain your discord application's oauth token and optionally channel IDs for 
+logging errors and feedback:
+    ```json
+    {
+        "token": "bottoken",
+        "error_log": "00000000000000000",
+        "feedback_log": "000000000000000000"
+    }
+    ```
+
+2. Use pip to install the project's dependencies:
+    ```
+    pip install -r requirements.txt
+    ```
+
+3. Run an instance of 
+[MongoDB Server](https://www.mongodb.com/download-center?jmp=homepage#community). 
+I'd recommend using the default port for configuration purposes.
+
+4. Run the application:
+    ```
+    python main.py
+    ```
+
+Please note that the database of cards will be empty when you first run the app. 
+Card information is retreived from the School Idol Tomoachi API in batches of 
+10 cards every 2 minutes. It will take a few update cycles for all of the 
+features to function as designed.
+