Add datepicker documentation

Author: Kamil Kisiela

README.md

@@ -34,15 +34,13 @@ Any requests? Add issue!
 
 ### theme (string)
 
-```
 md-theme attribute
-```
 
 ## Fields
 
 ### input
 
-```json
+```javascript
 {
   "type": "input",
   "key": "firstName",
@@ -58,7 +56,7 @@ md-theme attribute
 
 **rows (number, optional)**
 
-```json
+```javascript
 {
   "type": "textarea",
   "key": "bio",
@@ -78,7 +76,7 @@ md-theme attribute
 
 **valueProp (string, optional)**
 
-```json
+```javascript
 {
   "type": "radio",
   "key": "name",
@@ -104,7 +102,7 @@ md-theme attribute
 
 **valueProp (string, optional)**
 
-```json
+```javascript
 {
   "type": "select",
   "key": "name",
@@ -124,7 +122,7 @@ md-theme attribute
 
 ### checkbox
 
-```json
+```javascript
 {
   "type": "checkbox",
   "key": "terms",
@@ -137,7 +135,7 @@ md-theme attribute
 
 ### switch
 
-```json
+```javascript
 {
   "type": "switch",
   "key": "terms",
@@ -148,6 +146,42 @@ md-theme attribute
 }
 ```
 
+### datepicker
+
+**placeholder (string, optional)**
+
+md-placeholder
+
+**minDate (Date, optional)**
+
+md-min-date
+
+**maxDate (Date, optional)**
+
+md-max-date
+
+**filterDate (function, optional)**
+
+md-filter-date
+
+```javascript
+{
+  "type": "datepicker",
+  "key": "start",
+  "templateOptions": {
+    "theme": "custom",
+    "placeholder": "Start date",
+    "minDate": minDate, // instance of Date
+    "maxDate": maxDate, // instance of Date
+    "filterDate": function(date) {
+        // only weekends
+        var day = date.getDay();
+        return day === 0 || day === 6;
+    }
+  }
+}
+```
+
 ## Wrappers
 
 - mdInputContainer