Docs update with new fnctl commands (#273)

* Added high level roadmap.

* Changed to funtion.yaml.

* Added logo

* updating quickstart code example, WIP, waiting on another merge.

* Minor updates.

* Changed function.yaml to func.yaml and updated fnctl README.

docs/function-file.md

@@ -0,0 +1,53 @@
+# Function files
+
+Functions files are used to assist fnctl to help you when creating functions. 
+
+The files can be named as:
+
+- func.yaml
+- func.json
+
+An example of a function file:
+
+```yaml
+name: iron/hello
+version: 0.0.1
+type: sync
+memory: 128
+config:
+  key: value
+  key2: value2
+  keyN: valueN
+build:
+- make
+- make test
+```
+
+`app` (optional) is the application name to which this function will be pushed
+to.
+
+`image` is the name and tag to which this function will be pushed to and the
+route updated to use it.
+
+`route` (optional) allows you to overwrite the calculated route from the path
+position. You may use it to override the calculated route.
+
+`version` represents current version of the function. When publishing, it is
+appended to the image as a tag.
+
+`type` (optional) allows you to set the type of the route. `sync`, for functions
+whose response are sent back to the requester; or `async`, for functions that
+are started and return a task ID to customer while it executes in background.
+Default: `sync`.
+
+`memory` (optional) allows you to set a maximum memory threshold for this
+function. If this function exceeds this limit during execution, it is stopped
+and error message is logged. Default: `128`.
+
+`config` (optional) is a set of configurations to be passed onto the route
+setup. These configuration options shall override application configuration
+during functions execution.
+
+`build` (optional) is an array of shell calls which are used to helping building
+the image. These calls are executed before `fnctl` calls `docker build` and
+`docker push`.