Add readme for taginfo

Author: Rub21

images/taginfo/README.md

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+# OSM-Seed taginfo
+
+We build a docker container for taginfo software, the container will start the web service and also process required files to create databases.
+
+## Environment Variables
+
+All environment variables are located at [`.env-taginfo.example`](https://github.com/developmentseed/osm-seed/blob/develop/.env-taginfo.example), make a copy and name it as `.env-tagninfo` to use in osm-seed.
+
+- `URL_PLANET_FILE_STATE`: Url to the state file, that contains the URL for the latest planet PBF file. e.g [`state.txt`](https://planet.openhistoricalmap.org.s3.amazonaws.com/planet/state.txt), This is no required in case you set the `URL_PLANET_FILE` env var
+
+- `URL_HISTORY_PLANET_FILE_STATE`: Url to the full history state file, that contains the URL for the latest full history planet PBF file. e.g [`state.txt`](https://planet.openhistoricalmap.org.s3.amazonaws.com/planet/full-history/state.txt), This is no required in case you set the `URL_HISTORY_PLANET_FILE` env var
+
+- `URL_PLANET_FILE`: URL for the latest planet PBF file.
+- `URL_HISTORY_PLANET_FILE`: URL for the latest full history planet PBF file.
+- `TIME_UPDATE_INTERVAL` Interval time to update the databases, e.g: `50m` = every 50 minutes, `20h` = every 20 hours , `5d` = every 5 days
+
+The following env vars are required in the instance to update the values at: https://github.com/taginfo/taginfo/blob/master/taginfo-config-example.json
+
+- `INSTANCE_URL`: URL prefix for the site.
+- `INSTANCE_NAME`: Used in the title of all HTML pages.
+- `INSTANCE_DESCRIPTION` : Description of this taginfo instance. Will appear on the home page and about page.
+- `INSTANCE_ICON`: URL path to instance icon in the upper left.
+- `INSTANCE_CONTACT`: Contact name and email address.
+- `TAGINFO_PROJECT_REPO` : If you're implementing your own instances of taginfo with you own data, you need to look into the projects, clone the [taginfo-project ](https://github.com/taginfo/taginfo-projects) repo, and pass it in this env var.
+
+- `DOWNLOAD_DB`: Taginfo instances need 7 Sqlite databases to start up the web service, all of them can be downloaded from https://taginfo.openstreetmap.org/download. Or if you can download only some of them you can pass herec. e.g DOWNLOAD_DB=`languages wiki`, or DOWNLOAD_DB=`languages wiki projects chronology`.
+
+- `CREATE_DB`: If you want process you of data using the PBF files, you can pass the values. eg. CREATE_DB=`db projects` or CREATE_DB=`db projects chronology`.
+  Note: 
+  - Value `db` require to pass `URL_PLANET_FILE` or `URL_PLANET_FILE_STATE` 
+  - Value `projects` require to pass `TAGINFO_PROJECT_REPO` 
+  - Value `chronology` require to pass `URL_PLANET_FILE` or `URL_HISTORY_PLANET_FILE`