Added validation example.

examples/validate/README.md

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+ScriptForm validate example
+===========================
+
+This example shows extra validation options for fields.

examples/validate/job_validate.sh

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+#!/bin/sh
+
+echo "string = $string"
+echo "integer = $integer"
+echo "float = $float"
+echo "date = $date"

examples/validate/validate.json

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+{
+    "title": "Validation example",
+    "forms": {
+        "validate": {
+            "title": "Validated form",
+            "description": "This form is heavily validated",
+            "submit_title": "Validate it",
+            "script": "job_validate.sh",
+            "fields": [
+                {
+                    "name": "string",
+                    "title": "A string between 5 and 7 characters.",
+                    "type": "string",
+                    "required": true,
+                    "minlen": 5,
+                    "maxlen": 7
+                },
+                {
+                    "name": "integer",
+                    "title": "An integer between 10 and 20",
+                    "type": "integer",
+                    "required": true,
+                    "min": 10,
+                    "max": 20
+                },
+                {
+                    "name": "float",
+                    "title": "A real number between 0.5 and 1",
+                    "type": "float",
+                    "required": true,
+                    "min": 0.5,
+                    "max": 1.0
+                },
+                {
+                    "name": "date",
+                    "title": "A date",
+                    "type": "date",
+                    "required": true,
+                    "min": "2015-01-01",
+                    "max": "2015-02-01"
+                }
+            ]
+        }
+    }
+}