Add CaesarDataFetching Documentation.

docs/source/includes/_data_fetching.md

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+Fetching Caesar data, particularly a reduction, on subject load in the Classifier is becoming a more common workflow. As an example of this use case, imagine a volunteer correcting a machine-generated annotation. This guide outlines the data structure that is required for each of the supported tools below. This is meant to provide a reference for generating CSV files that can be uploaded to Caesar.
+
+The base structure required by Caesar in the `data` field of the csv is an object - denoted as `{}` in JSON. The `data` attribute on this root object is an array of annotation objects that will be displayed on a subject. Below is the core structure shared by them all.
+
+```js
+{
+  // which step in the workflow, usually S0
+  "stepKey": "S0",
+  // index of task in the workflow, usually 0
+  "taskIndex": 0,
+  // correlates with taskIndex, usually T0
+  "taskKey": "T0",
+  // all supported taskTypes are drawing
+  "taskType": "drawing",
+  // index of tool in the task, usually 0
+  "toolIndex": 0,
+  // usually 0 unless in multi-frame view
+  "frame": 0,
+  // alphanumeric string that must be unique across all annotations in the array
+  "markId": "clhhuqm9",
+  // supported toolType values are listed in the examples below
+  "toolType": "<tool-from-below>",
+}
+```
+
+## Drawing Tools
+
+### Circle tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "circle",
+      "r": 103,
+      "x_center": 574,
+      "y_center": 198
+    }
+  ]
+}
+```
+
+### Ellipse tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "ellipse",
+      "angle": 23,
+      "rx": 215,
+      "ry": 81,
+      "x_center": 650,
+      "y_center": 269
+    }
+  ]
+}
+```
+
+### FreehandLine tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "freehandLine",
+      "pathX": [ 200, 250, 250, 200 ],
+      "pathY": [ 100, 100, 150, 150 ]
+    }
+  ]
+}
+```
+
+### Line tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "line",
+      "x1": 377,
+      "x2": 690,
+      "y1": 223,
+      "y2": 281
+    }
+  ]
+}
+```
+
+### Point tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "point",
+      "x": 330,
+      "y": 122
+    }
+  ]
+}
+```
+
+### Polygon tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "polygon",
+      "points": [
+        { "x": 341, "y": 143 },
+        { "x": 225, "y": 246 },
+        { "x": 379, "y": 300 }
+      ]
+    }
+  ]
+}
+```
+
+### Rectangle tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "rectangle",
+      "height": 201,
+      "width": 437,
+      "x_center": 651,
+      "y_center": 334
+    }
+  ]
+}
+```
+
+### RotateRectangle tool
+
+```json
+{
+  "data": [
+    {
+      "stepKey": "S0",
+      "taskIndex": 0,
+      "taskKey": "T0",
+      "taskType": "drawing",
+      "toolIndex": 0,
+      "frame": 0,
+      "markId": "clhhuqm9",
+      "toolType": "rotateRectangle",
+      "angle": -35,
+      "height": 84,
+      "width": 217,
+      "x_center": 454,
+      "y_center": 295
+    }
+  ]
+}
+```