Adds How To create a stateful service (#72)

* add how to create a stateful service

* remove space

* Updates to review

howto/create-stateful-service/Readme.md

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+# Create a stateful service
+
+State management is one of the most common needs of any application: new or legacy, monolith or microservice.
+Dealing with different databases libraries, testing them, handling retries and faults can be time consuming and hard.
+
+Dapr provides state management capabilities that include consistency and concurrency options.
+In this guide we'll start of with the basics: Using the key/value state API to allow an application to save, get and delete state.
+
+## 1. Setup a state store
+
+A state store component represents a resource that Dapr uses to communicate with a database.
+For the purpose of this howto, we'll use a Redis state store.
+
+See a list of supported state stores [here](../setup-state-store/supported-state-stores.md)
+
+### Using the Dapr CLI
+
+When using using `Dapr init` in Standalone mode, the Dapr CLI automatically provisions a state store (Redis) and creates the relevant YAML when running your app with `dapr run`.
+To change the state store being used, replace the YAML under `/components` with the file of your choice.
+
+### Kubernetes
+
+See the instructions [here](../setup-state-store) on how to setup different state stores on Kubernetes.
+
+## 2. Save state
+
+The following example shows how to save two key/value pairs in a single call using the state management API, both of which are saved with the single `key1`name over http.
+
+*The following example is written in Python, but is applicable to any programming language*
+
+```python
+import requests
+import json
+
+stateReq = '[{ "key": "k1", "value": "Some Data"}, { "key": "k2", "value": "Some More Data"}]'
+response = requests.post("http://localhost:3500/v1.0/state/key1", json=stateReq)
+```
+
+## 3. Get state
+
+The following example shows how to get an item by using a key with the state management API over http:
+
+*The following example is written in Python, but is applicable to any programming language*
+
+```python
+import requests
+import json
+
+response = requests.get("http://localhost:3500/v1.0/state/key1")
+print(response.text)
+```
+
+## 4. Delete state
+
+The following example shows how to delete an item by using a key with the state management API over http:
+
+*The following example is written in Python, but is applicable to any programming language*
+
+```python
+import requests
+import json
+
+response = requests.delete("http://localhost:3500/v1.0/state/key1")
+```