Merge pull request #10 from ebu/fix/manifest-file-name

Suggestion: add requirement to manifest file name

Author: nytamin

v1/examples/l3rd-name/l3rd-manifest.json renamed to v1/examples/l3rd-name/l3rd.ograf

@@ -52,7 +52,9 @@ directly or indirectly referenced from the Manifest file and can be seen as depe
 
 ### Manifest Model
 
-The manifest file is a JSON file containing metadata about the Graphic. It consists of the following fields:
+The manifest file is a JSON file containing metadata about the Graphic.
+The file name of the manifest file MUST end with `.ograf` (e.g. `my-graphic.ograf`).
+It consists of the following fields:
 
 | Field               | Type               | Required | Default | Description                                                                                                                                                        |
 |---------------------|--------------------|:--------:|:-------:|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
@@ -70,6 +72,9 @@ The manifest file is a JSON file containing metadata about the Graphic. It consi
 | stepCount           | integer            |          |    1    | The number of steps a Graphic consists of.                                                                                                                         |
 | renderRequirements  | RenderRequirement[]|          |         | A list of requirements that this Graphic has for the rendering environment. At least one of the requirements must be met for the graphic to be expected to work.   |
 
+There MAY be multiple manifest files in a folder. In the case of multiple manifest files, will be interpreted as multiple, independent Graphics.
+(This can be useful for example when having a package of multiple OGraf graphics, which then might share resources such as images, fonts, etc.)
+
 #### Real-time vs. non-real-time
 
 Real-time rendering of a Graphic means that the Graphic is animated at real-time speed, typically in the context of live TV.