add readme

docs/README.md

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+**ffplayout-engine Documentation**
+================
+
+### **[For Developer](/docs/developer.md)**
+
+Learn how to setup a developer environment and to cross compile for different platforms.
+
+### **[Folder Mode](/docs/folder_mode.md)**
+
+Learn more about playing the content of a folder.
+
+### **[Live Ingest](/docs/live_ingest.md)**
+
+Using live ingest to inject a live stream.
+
+### **[Output Modes](/docs/output.md)**
+
+The different output modes.
+
+### **[Preview Stream](/docs/preview_stream.md)**
+
+Setup and use a preview stream.
+
+### **[Remove Sources](/docs/remote_source.md)**
+
+Use of remote sources, like https://example.org/video.mp4