add doc, remove di, add symbol_shifting

doc.md

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+# RDS95
+
+RDS95 is a ligth software RDS encoder for linux
+
+RDS95 follows the IEC 62106 standard (available at the RDS Forum website)
+
+## Diffrences between IEC 62106 and EN 50067
+
+The newer standard which is the IEC one, removes these features:
+
+- MS
+- PIN
+- LIC
+- DI (partially, only dynamic pty is left)
+
+## Commands
+
+### PS
+
+Sets the Program Service: `PS=* RDS *`
+
+### PI
+
+Sets the PI code: `PI=FFFF`
+
+### TP
+
+Sets the TP flag: `TP=1`
+
+### TA
+
+Sets the TA flag and triggers Traffic PS: `TA=0`  
+*May be overridden by EON*
+
+### DPTY
+
+Sets the DPTY flag: `DPTY=1`  
+*Formerly DI*
+
+### CT
+
+Toggles the transmission of CT groups: `CT=1`  
+
+### AF
+
+Sets the AF frequencies: `AF=95,89.1`  
+Clears the AF: `AF=`  
+
+### TPS
+
+Sets the Traffic PS: `TPS=Traffic!` (default not set)  
+*TPS is transmitted instead of PS when TA flag is on*
+
+### RT1
+
+Sets the first radio text: `RT1=Currently Playing: Jessie Ware - Remember Where You Are` or `TEXT=Currently Playing: Jessie Ware - Remember Where You Are`  
+
+### RT2
+
+Sets the second radio text: `RT2=Radio Nova - Best Hits around!`  
+
+### PTY
+
+Sets the programme type flag: `PTY=11`
+
+PTY values are diffrent for RDS and RDBS, look for them online
+
+### ECC
+
+Sets the extended country code: `ECC=E2`  
+*Note that the ECC is depended on the first letter of the PI, for example PI:3 and ECC:E2 is poland, but PI:1 would be the czech republic*
+
+### RTP
+
+TODO: RTP
+
+### LPS
+
+Sets the LPS: `LPS=NovaFM❤️`  
+*Note that LPS does UTF-8, while PS, RT don't*  
+
+### PTYN
+
+Sets the programme type name: `PTYN=Football`
+
+### AFCH
+
+TODO: AFCH  
+
+### UDG1
+
+Sets the user defined group, max 8 groups: `UDG1=6000FFFFFFFF`  
+
+### UDG2
+
+See [UDG1](#udg1)
+
+### G
+
+Sends a custom group to the next group available: `G=F100FFFFFFFF` or `G=00002000AAAAAAAA` for RDS2
+
+### RT1EN
+
+Enables RT 1: `RT1EN=1`  
+
+TODO: Rest of commands