Add aiocache with gunicorn example

examples/gunicorn-aiocache-api/README.md

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+# Gunicorn + AioHTTP + AioCache + SharedMemoryDict
+
+## Requirements:
+- SharedMemoryDict + AioCache (`pip install shared-memory-cache[aiocache]`)
+- AioHTTP
+- Gunicorn
+
+## To Run:
+```
+$ gunicorn main:app --config gunicorn_config.py -w 3 --worker-class aiohttp.GunicornWebWorker 
+```
+
+## Write on cache
+```
+$ curl -d "key=foo&value=bar" localhost:8000/
+```
+
+## Read from cache
+```
+$ curl localhost:8000/?key=foo
+```

examples/gunicorn-aiocache-api/gunicorn_config.py

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+from shared_memory_dict.hooks import create_shared_memory, free_shared_memory
+
+
+def on_starting(server):
+    create_shared_memory(name='sm', size=1024)
+
+
+def on_exit(server):
+    free_shared_memory(name='sm')

examples/gunicorn-aiocache-api/main.py

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+from aiocache import caches
+from aiohttp import web
+
+
+caches.set_config({
+    'default': {
+        'cache': 'shared_memory_dict.caches.aiocache.SharedMemoryCache',
+        'name': 'sm'
+    }
+})
+
+
+class Handler(web.View):
+
+    async def get(self):
+        key = self.request.query.get('key', '')
+        text = await self.request.app['cache'].get(key)
+        return web.Response(text=text)
+
+    async def post(self):
+        data = await self.request.post()
+        await self.request.app['cache'].set(data['key'], data['value'])
+        return web.Response(text='OK!')
+
+
+async def app_shutdown(app):
+    await app['cache'].close()
+
+
+app = web.Application()
+app.router.add_view('/', Handler)
+
+app['cache'] = caches.get('default')
+app.on_shutdown.append(app_shutdown)
+
+
+if __name__ == '__main__':
+    web.run_app(app)