Create index README

conf/elasticsearch/REAME.md

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+# Ahmia index
+Ahmia search engine use elasticsearch to index content.
+
+## Installation
+Please install elastic search from the official repository thanks to the [official guide](https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-repositories.html)
+
+## Configuration
+Default configuration is enough to run index in dev mode. Here is suggestion for a more secure configuration
+
+### /etc/security/limits.conf
+
+```
+elasticsearch - nofile unlimited
+elasticsearch - memlock unlimited
+```
+
+### /etc/default/elasticsearch 
+on CentOS/RH: /etc/sysconfig/elasticsearch
+
+```
+ES_HEAP_SIZE=2g # Half of your memory, other half is for Lucene
+MAX_OPEN_FILES=1065535
+MAX_LOCKED_MEMORY=unlimited
+```
+
+### /etc/elasticsearch/elasticsearch.yml
+
+```
+bootstrap.mlockall: true
+```
+
+## Start the service
+
+```sh
+# systemctl start elasticsearch
+```
+
+## Init mappings
+Please do this when running for the first time
+
+```sh
+$ curl -XPUT -i "localhost:9200/crawl/" -d "@./mappings.json"
+```