[DOC] Start riting tutorials and basic documentation.

doc/001_bases.bb

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+=?=RIVER: Bases =?=
+__________________________________________________
+[right][tutorial[000_Build | Next: Tutorals]][/right]
+
+=== Overview:===
+
+===User requires:===
+To use ewol you need to know only C++ language. It could be usefull to know:
+:** [b]Python[/b] for all build tool.
+:** [b]git[/b] for all version management
+:** [b]Audio[/b] Basic knowlege of audio streaming af data organisation.
+
+=== Architecture:===
+River has been designed to replace the pulseAudio basic asyncronous interface that create 
+more problem that it will solve. The second point is that is not enougth portable to be 
+embended in a proprietary software without distributing all the sources (Ios).
+
+Start at this point we will have simple objectives :
+:** manage multiple Low level interface: (done by the [lib[airtaudio | AirTAudio]] interface):
+::** for linux
+:::** Alsa
+:::** Pulse
+:::** Oss
+::** for Mac-OsX
+:::** CoreAudio
+::** for IOs
+:::** CoreAudio (embended version)
+::** for Windows
+:::** ASIO
+::** For Android
+:::** Java (JDK-6)
+:** Synchronous interface ==> no delay and reduce latency
+:** Manage the thread priority (need sometimes to be more reactive)
+:** manage mixing of some flow (2 inputs stereo and the user want 1 input quad)
+:** AEC Acoustic Echo Cancelation (TODO : in the current implementation we have a simple sound cutter)
+:** Equalizer (done with [lib[drain | Drain])
+:** Resmpling (done by the libspeexDSP)
+:** Correct volume management (and configurable)
+:** Fade-in and Fade-out (done with [lib[drain | Drain])
+:** Channel reorganisation (done with [lib[drain | Drain])
+:** A correct feedback interface