Add property marker-symbolcolor for marker text and symbol color

1.1.1/README.md

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+# simplestyle-spec
+
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
+"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in
+this document are to be interpreted as described in [RFC 2119](https://www.ietf.org/rfc/rfc2119.txt).
+
+## 1. Purpose
+
+This specification attempts to create a standard for styling
+geospatial data that can be shared across clients.
+
+## 2. File format
+
+`simplestyle` is a set of agreed-upon 'special values' in
+the pre-existing [GeoJSON](http://geojson.org/) data standard that
+define styles. As such, files implementing `simplestyle` are by
+definition valid GeoJSON files and valid [JSON](http://json.org/) files.
+
+## 3. Client Behavior
+
+The entirety of the `simplestyle` spec is optional, so any combination of
+specified properties are valid. When properties are not given, the defaults
+below are assumed by implementations.
+
+Multi features are assumed to have the same styling rules as single features---
+MultiPoints are styled as Points, MultiPolygons as Polygons, and MultiLineStrings
+as LineStrings. `marker` styles do not affect `stroke` and `fill` rules and vice versa.
+The behavior of `fill` rules on LineStrings is undefined, but implementations
+are encouraged to set `fill` to 0 by default in that case.
+
+```javascript
+// COLOR RULES
+// Colors can be in short form:
+//   "#ace"
+// or long form
+//   "#aaccee"
+// with or without the # prefix.
+// Colors are interpreted the same as in CSS,
+// in #RRGGBB and #RGB order.
+// But other color formats or named colors
+// are not supported
+{
+    "type": "FeatureCollection",
+    "features": [{ "type": "Feature",
+        "geometry": {
+            "type": "Point",
+            "coordinates": [0, 0]
+        },
+        "properties": {
+            // OPTIONAL: default ""
+            // A title to show when this item is clicked or
+            // hovered over
+            "title": "A title",
+
+            // OPTIONAL: default ""
+            // A description to show when this item is clicked or
+            // hovered over
+            "description": "A description",
+
+            // OPTIONAL: default "medium"
+            // specify the size of the marker. sizes
+            // can be different pixel sizes in different
+            // implementations
+            // Value must be one of
+            // "small"
+            // "medium"
+            // "large"
+            "marker-size": "medium",
+
+            // OPTIONAL: default ""
+            // a symbol to position in the center of this icon
+            // if not provided or "", no symbol is overlaid
+            // and only the marker is shown
+            // Allowed values include
+            // - Icon ID from the Maki project at http://mapbox.com/maki/
+            // - An integer 0 through 9
+            // - A lowercase character "a" through "z"
+            "marker-symbol": "bus",
+
+            // OPTIONAL: default "7e7e7e"
+            // the marker's color
+            //
+            // value must follow COLOR RULES
+            "marker-color": "#fff",
+
+            // OPTIONAL: default "#fff"
+            // the marker's text or symbol color
+            //
+            // value must follow COLOR RULES
+            "marker-symbolcolor": "#000",
+
+            // OPTIONAL: default "555555"
+            // the color of a line as part of a polygon, polyline, or
+            // multigeometry
+            //
+            // value must follow COLOR RULES
+            "stroke": "#555555",
+
+            // OPTIONAL: default 1.0
+            // the opacity of the line component of a polygon, polyline, or
+            // multigeometry
+            //
+            // value must be a floating point number greater than or equal to
+            // zero and less or equal to than one
+            "stroke-opacity": 1.0,
+
+            // OPTIONAL: default 2
+            // the width of the line component of a polygon, polyline, or
+            // multigeometry
+            //
+            // value must be a floating point number greater than or equal to 0
+            "stroke-width": 2,
+
+            // OPTIONAL: default "555555"
+            // the color of the interior of a polygon
+            //
+            // value must follow COLOR RULES
+            "fill": "#555555",
+
+            // OPTIONAL: default 0.6
+            // the opacity of the interior of a polygon. Implementations
+            // may choose to set this to 0 for line features.
+            //
+            // value must be a floating point number greater than or equal to
+            // zero and less or equal to than one
+            "fill-opacity": 0.5
+        }
+    }]
+}
+```