#1 WIP on reading understanding JSON schema

understanding-json-schema.md

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+### JSON SCHEMA
+
+**JSON schema is a powerful tool for validating the structure of JSON data.**
+
+_But what does it actually mean in layman's term?_
+
+What is JSON?
+* Javascript Object Notation
+* store information.
+* Uses following data structures
+    * Object, Array, Number, String, Boolean, Null  
+
+```js
+{  
+	“key1”: “value1”,
+	“key2”: “value2”,
+}
+```
+
+#### What is a JSON schema?
+* used to define the structure of the JSON Object.
+* useful tool for defining what type of data structure you want to return.
+
+**E.G.**  
+When a user submits a form, you want to validate all the information they may have entered.
+
+Expected Object:
+```js
+{
+	“type”: “object”,
+	“properties”: {
+		“first name”: { “type”: “string” },
+		“first name”: { “type”: “string” },
+		“age” : { “type”:  “number” }
+	}
+}
+```
+Now if the submit a the following object:  
+```js
+{
+	 “first name”:”Mickey”,
+	“last name”: “Mouse”
+}
+```
+It would fail the validation that we have put in place. But, the following object:  
+```js
+{
+	 “first name”:”Mickey”,
+	“last name”: “Mouse”,
+	“age”: 100
+}
+```
+It would pass the validation.
+
+**There we have our first JSON Schema for validation purposes! :smile:**
+
+
+-------------------------------------------------
+
+#### How to Restrict to specific Types
+
+```js
+"type": "string"
+"type": "number"
+"type": "object"
+"type": "array"
+"type": "boolean"
+"type": "null"
++ many more to be added here...
+```
+
+You can also allow for multiple types using the following method"
+
+```js
+{ "type": ["number", "string"] }
+
+```
+Both of the options below would be valid  
+`42` :heavy_check_mark:  
+`"This is a String"` :heavy_check_mark:  
+
+#### How to declare a JSON schema
+
+
+```js
+{ "$schema": "http://json-schema.org/schema" }
+```
+
+This allows you to tell the difference between a JSON schema and just some JSON (**good practice to use this declaration**)
+
+```js
+{ "id": "http://yourdomainname/myschema.json" }
+```
+Unique identifier for your schema.
+
+**Question:** Can you only have one schema per app? ( how would be define the id's for multiple schemas in an app, can we just link to the same domain?)