docs(example): File Feed Example

examples/access-go-ipfs-files/file-exchange/.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+node_modules
+
+# testing
+coverage
+
+# production
+build
+
+# misc
+.DS_Store
+.env
+npm-debug.log
+
+# orbit-db
+orbit-db

examples/access-go-ipfs-files/file-exchange/README.md

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+# Accessing go-ipfs files from the browser
+
+**WIP**
+
+InterPlanetary File Exchange enables you to share files with others via IPFS. 
+
+IPFE was built to demonstrate interoperability between the go-ipfs and js-ipfs (browser and Node.js) instances.
+
+## TODO
+
+- Need to merge https://github.com/ipfs/browserify-zlib-next/pull/23 and use the updated module. Otherwise the UI will error on zlib._transform.
+- Make sure go-ipfs and the UI connect to each other (last time I checked they didn't)
+- Use new signal server address everywhere (src/App.js, ipfe-daemon.js, ipfe-add.js)
+- ipfe-add currently uses js-ipf(node.js) daemon. But in order to add files from go-ipfs daemon, it would need to use js-ipfd-ctl. A quick way would be to use ipfs-daemon (I would *highly* recommend to do so), otherwise need to add the init dance for js-ipfsd-ctl much like `src/ipfs.js`.
+
+## Requirements
+
+- Node.js >= v4.x
+- Npm >= v3.x
+
+## Step-by-step Instructions
+
+### Start a go-ipfs daemon
+
+1. Install go-ipfs from master (TODO: link). 
+
+2. Run `ipfs init`
+
+3. Edit your IPFS config file, located at `~/.ipfs/config`
+
+4. Add a Websocket listener address to `Addresses.Swarm`. It should look like this after editing:
+```
+"Addresses": {
+  "API": "/ip4/127.0.0.1/tcp/5001",
+  "Gateway": "/ip4/0.0.0.0/tcp/8080",
+  "Swarm": [
+    "/ip4/0.0.0.0/tcp/4001",
+    "/ip4/0.0.0.0/tcp/9999/ws"
+  ]
+},
+```
+
+5. Start the go-ipfs daemon with:
+```
+ipfs daemon
+```
+
+6. You should see the Websocket address in the output:
+```
+Initializing daemon...
+Swarm listening on /ip4/127.0.0.1/tcp/4001
+Swarm listening on /ip4/127.0.0.1/tcp/9999/ws
+Swarm listening on /ip4/192.168.10.38/tcp/4001
+Swarm listening on /ip4/192.168.10.38/tcp/9999/ws
+API server listening on /ip4/127.0.0.1/tcp/5001
+Gateway (readonly) server listening on /ip4/0.0.0.0/tcp/8080
+Daemon is ready
+```
+
+If you see address like `Swarm listening on /ip4/127.0.0.1/tcp/9999/ws`, it means all good!
+
+### Start an InterPlanetary File Exchange daemon
+
+1. Install the project's dependencies:
+```
+npm install
+```
+
+2. Start the browser app with:
+```
+npm start
+```
+
+This will open the app in your browser at http://localhost:3000/.
+
+3. In the browser app, open a file exchange feed url, eg. http://localhost:3000/hello-world.
+
+4. Start the Node.js ipfe-daemon with:
+```
+node ipfe-daemon hello-world
+```
+
+The first argument after `ipfe-daemon` is the name of the file exchange feed.
+
+5. In the browser app, open the Peers view by clicking on "Searching for peers..." or "1 peer". You will see which peers you're connected to.
+
+6. Now go back to the terminal and find the Websocket multiaddress of your go-ipfs daemon by running:
+```
+ipfs id
+```
+
+This will output all the address your go-ipfs daemon is listening at. Find the one with `ws` in it, and the port you added to the go-ipfs configuration file. It looks something like this:
+```
+/ip4/127.0.0.1/tcp/9999/ws/ipfs/QmZGH8GeASSkSZoNLPEBu1MqtzLTERNUEwh9yTHLEF5kcW
+```
+
+7. Copy the address and paste it into the "Connect" input field in the browser app and press "Connect".
+
+8. You should now see the two IPFS instances connected. You can verify it by observing the Peer view in the browser app and running the following command in the terminal:
+```
+ipfs swarm peers
+```
+
+### Add files to InterPlanetary File Exchange
+
+1. Add a file by running:
+```
+node ipfe-add hello-world ipfe-add.js
+```
+
+You should see the following output:
+```
+Starting...
+Swarm listening on /libp2p-webrtc-star/ip4/127.0.0.1/tcp/9090/ws/ipfs/QmYRSN9BdRU5oYM1ryAWF518ogv8SkwZyux4aEWpxoaYZA
+IPFS node is ready
+New peers for 'hello-world':
+QmRNhXuS78LtUVLdJUJKmeLfE7K64CGBmwCiXY1sgJ6NaV
+------------------------------
+File | Hash | Size | Mime Type
+------------------------------
+ipfe-add.js | Qmdp8yhkyNGeqEYpkpqAm7duYqsEiJUi3KXfUFuUcyR2GR | 2588 | application/javascript
+```
+
+Note that the multihash at the end of the swarm address will be different.
+
+6. Once you see the output above, it means the file was added successfully!
+
+7. Now go back to the browser app and observe the file in the list of files.
+
+8. Click the file to open it.
+
+9. You have successfully added a file in go-ipfs and downloaded it to the browser.
+
+You can also add files to the browser app by dragging and dropping them. Once you do so, you should see the updated file list in the terminal running `ipfe-daemon`.