dual stream bug, check setAudioProfile and add user manual

UserManual.md

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+# User Manual
+
+# Agora RTC Tool
+
+* Select Tool in menu
+* Agora Rtc Tool
+* Show a Dialog for rtc
+
+# Main UI
+
+* Start Streaming to Agora
+
+     Start Streaming, you need to set basic information when first Start Streaming.
+
+* Settings
+
+     Show settings dialog. Set basic information for rtc in this dialoig including audio, video and rtmp streaming information.
+
+* Exit
+
+      Close dialog for rtc.
+
+# Setting UI
+
+
+## General
+
+Fill user basic information
+
+* Load configure file (fill channel information manually)
+
+    * Load configure file, [download url](https://github.com/AgoraIO/OBS/releases/download/3.3.0/AgoraObs.zip)
+    * Unzio file, fill information such as Appid etc.
+    * Clicj Load button, it'll load information to the dialo.
+    * configure：
+
+            AppId=       
+            AppToken=    
+            UID=         
+            ChannelName= 
+            RtmpUrl=     
+
+
+* Get Channel InformationMode
+
+    * Input Information Manually
+
+         fill information manually 
+    * Get Infomation by http get request
+
+          When user click, "Start Streaming to Agora",it'll call http request.
+          Customer need build a http server for http request. User input a http url, then http server 
+          response json string including channel information. Json format：
+
+            {
+            	"code": 0,
+            	"data": {
+            		"appID": "xxxx",
+            		"channelName": "xxxxx",
+	            	"uid": "1200433",
+	            	"token": "xxxx",
+	            	"cameraUid": "1303713",
+	            	"cameraToken": "xxxxxx"
+	            }
+            }
+*  APPID  
+
+    Agora appid. After register agora account, you can create project, then it'll generate an appid.
+
+* initialize
+
+  Initialize agora rtc engine. If user wants to set playback device before Start Streaming to Agora, Initialize first.
+
+*  AppToken  
+
+   Calculate token by appid, app certificate, channel Name and Uid.   
+
+
+* Channel Name 
+
+     Join Channel need channel Name.
+
+* Uid
+
+      user id.
+
+
+* camera uid
+
+    If only send obs camera video, you need to set an camera user id. 
+* camera token  
+
+    a token for camera user id
+* send camera vieo
+
+    If check this, it'll send obs camera video alone, beside send the whole obs video.If audience run app backend, app need to show video on a samll window.
+
+    Audience app can decide to show camera video or main video depending that app run backend or not.    
+
+* CPU Threshold
+
+    If cpu reach the threshold value multiple times in two minutes, obs will show a information dialog to tell user need close some unused windows application.   
+
+* Audio and Video log interval
+
+     Log obs push audio and video time in this inverval.    
+
+* Mute all remote audio and video
+
+    If broadcaster doesn't want to receive audio and video from remote user. Check this check box.
+
+* Save all Setings except APPID, including audio video and rtmp settings
+
+       When close obs, it'll save basic informations except APPID and load information automatically when start obs next time.      
+
+* Dual Stream
+
+      Send high and low obs video stream.
+* Persist Save APPID
+
+      Save appid locally permanetly, not suggested. 
+
+
+
+## Audio
+
+* Sample Rate
+
+    Unused, use 48kHz.
+* Channels
+
+    For audio profile parameter, need to use with high quality. For example: if select stereo, it'll setAudioProfile parameter:     
+
+        AUDIO_PROFILE_MUSIC_STANDARD_STEREO or AUDIO_PROFILE_MUSIC_HIGH_QUALITY_STEREO
+
+    If set mono, it'll set:
+
+        AUDIO_PROFILE_MUSIC_STANDARD or AUDIO_PROFILE_MUSIC_HIGH_QUALITY
+
+* Audio Scenario
+
+     Audio Profile
+
+* High Quality
+
+     If check this, Audio Profile will be
+
+        AUDIO_PROFILE_MUSIC_HIGH_QUALITY or AUDIO_PROFILE_MUSIC_HIGH_QUALITY_STEREO
+
+* Save OBS PCM Data
+
+     Save pcm file in obs log folder.
+
+**Note**
+
+    If you need to know more about audio profile parameter, you can reference setAudioProfile paramter on agora.io  
+
+
+ * Playout Device Settings
+
+       You need click Initialize button, when start plugin first time. Or you can Start Streaming to Agora, you can set play device and adjust playback device volume. 
+
+* loopback
+
+     Agora sdk capture playback device. If check this, obs desktop audio need to mute.   
+
+## Video
+
+  video encoder configuraion
+
+*  First Output Bitrate
+
+    * Use Agora Bitrate
+
+          Agora SDK will calculate video bitrate.
+    * Use OBS Bitrate
+
+         Use bitrate in obs setting dialog.
+* Second Output Bitrate
+
+
+    Reference VideoEncoderConfiguration on agora.io：
+
+        COMPATIBLE_BITRATE
+        STANDARD_BITRATE
+        DEFAULT_MIN_BITRATE
+
+* Camera Encoder Resolution
+
+    In General, only valid when check Send Obs Camera Video. You can set camera VideoEncoderConfiguration dimension.
+
+* Camera Encoder Bitrate
+
+       In General, only valid when check Send Obs Camera Video.You can set camera VideoEncoderConfiguration Bitrate.
+
+*Camera Encoder FPS
+
+       In General, only valid when check Send Obs Camera Video.You can set camera VideoEncoderConfiguration frameRate.
+
+
+## Agora Rtmp
+
+  SetLiveTranscoding Parameter
+
+* Url 
+
+   Agora rtmp url, addPublishStreamUrl.
+
+* FPS
+
+    rtmp FPS
+
+* width and height
+
+    rtmp width and height
+
+## Network Test
+
+
+* Start Network Test
+
+    Network Test before joinchannel, you'll get network test result. Need Initlize first.  
+
+    Stop Network Test before start Streaming.