Added quick endpoint docs

docs.md

@@ -0,0 +1,48 @@
+# Quick Documentation
+
+Available endpoints:
+
+- `GET  /<root>`
+    - Display the chart homepage, by default the chart will show the last 60 minutes, updating every 30 seconds.
+- `GET  /<root>?show-minutes=120`
+    - Display the chart homepage, overriding the default 60 minutes to the desired number.
+- `POST /<root>`
+    - Submit a snapshot to the database in the format of the following example JSON: 
+    
+    ```json
+    {
+        "time": "2020-11-13 22:20:44.651953",
+        "temp": 25.2, 
+        "humidity": 65.4, 
+        "co2": 450
+    }
+    ```
+- `GET  /<root>/data`
+    - Retrieve a json of data snapshots over the last 60 minutes in the following format:
+
+    ```json
+    {
+      "snapshots": [
+        {
+          "id": 8868,
+          "time": "2020-11-13 20:00:12",
+          "temp": 21.7,
+          "humidity": 57.3,
+          "co2": 958
+        },
+        {
+          "id": 8867,
+          "time": "2020-11-13 19:59:42",
+          "temp": 21.7,
+          "humidity": 57.3,
+          "co2": 957
+        },
+        // ...
+      ]
+    } 
+    ```
+
+- `GET  /<root>/data/now`
+    - In the same format as above, retrieve the latest snapshot.
+- `GET  /<root>/data?since=2006-01-02T15:04:05Z`
+    - In the same format as above, retrieve all snapshots recorded since the given ISO date.