Added README to new examples directory explaining contributions, added auto-generated world_bank example

.gitignore

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+/*.gz

README.md

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-This repo holds/serves the small data files that
-`superset load_examples` uses to load the example data into user
-databases.
+# Superset Examples Repository
+
+This repo holds/serves the examples for the Apache Superset ecosystem that are accessed by the `superset examples` command.
+
+## Listing Examples
+
+Examples can be listed via the Apache Superset CLI:
+
+`superset examples list —-help`
+
+```bash
+Usage: superset examples list [OPTIONS]
+
+  List example Slices/Dashboards/datasets
+
+Options:
+  -r, --examples-revision TEXT  Revision of examples to list
+  --help                        Show this message and exit.
+```
+
+## Contributing Examples
+
+This repository can be used to submit Apache Superset examples. Install the system requirements below, and then follow 
+the contributing instructions.
+
+### System Requirements
+
+In order to contribute examples you will need Git LFS to contribute the data that goes along with your Dashboard export 
+`dashboard.json` file.
+
+Creating, removing, listing and loading examples can be handled without Git LFS but adding examples to this directory of 
+examples will require it. 
+
+Git LFS can be [installed](https://github.com/git-lfs/git-lfs/wiki/Installation) via:
+
+```bash
+# OS X
+brew install git-lfs
+# port install git-lfs
+git lfs install
+```
+
+```bash
+# Ubuntu
+curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash
+sudo apt-get install git-lfs
+git lfs install
+```
+
+## Contributing an Example
+
+To export an example dashboard from Apache Superset, use the `superset examples create` command to produce a gzipped 
+tarball. 
+
+`superset examples create --help`
+
+```bash
+Usage: superset examples create [OPTIONS]
+
+  Create example Slice/Dashboard/datasets
+
+Options:
+  -i, --dashboard-id INTEGER  Specify dashboard id to export
+  -t, --dashboard-title TEXT  Specify dashboard title to export
+  -d, --description TEXT      Description of new example  [required]
+  -e, --example-title TEXT    Title for new example  [required]
+  -f, --file-name TEXT        Specify export file name. Defaults to
+                              dashboard.tar.gz
+  -l, --license TEXT          License of the example dashboard
+  --help                      Show this message and exit.
+```
+
+For example, to export the `World's Bank Data` example, you would run the following:
+
+```bash
+superset examples create \
+    --dashboard-title "World's Bank Data" \
+    --description "World Bank Data on global population trends from 1960 through 2010" \
+    --example-title "World Bank Data" \
+    --file-name "world_bank_example.tar.gz" \
+    --license "Apache 2.0"
+```
+
+Next, copy and then expand the tarball into the root directory of this project. Git add the directory this creates, commit 
+and push the changes to your own branch and then submit a pull request to 
+[https://github.com/apache/examples-data](https://github.com/apache/examples-data). Once approved, your example will 
+automatically be listed among the available examples listed by the `superset examples list` command.