Quickstart guide:

1. Set the emulator host environment variable:  
  export SPANNER_EMULATOR_HOST=localhost:9010
2. Start the emulator:  
  docker run -p 9010:9010 --rm -it \<image\>
3. Run the Spanner samples:  
  java -jar java-samples-1.0-SNAPSHOT.jar \<operation\> \<instance\> \<database\>


Quickstart guide:

1. Set the emulator host environment variable:  
  export SPANNER_EMULATOR_HOST=localhost:9010
2. Start the emulator:  
  docker run -p 9010:9010 --rm -it \<image\>
3. Run the Spanner samples:  
  java -jar java-samples-1.0-SNAPSHOT.jar \<operation\> \<instance\> \<database\>

List of Sample Operations (\<operation\> \<instance\> \<database\>):
    createdatabase my-instance example-db
    write my-instance example-db
    delete my-instance example-db
    query my-instance example-db
    read my-instance example-db
    addmarketingbudget my-instance example-db
    update my-instance example-db
    writetransaction my-instance example-db
    querymarketingbudget my-instance example-db
    addindex my-instance example-db
    readindex my-instance example-db
    queryindex my-instance example-db
    addstoringindex my-instance example-db
    readstoringindex my-instance example-db
    readonlytransaction my-instance example-db
    readstaledata my-instance example-db
    addcommittimestamp my-instance example-db
    updatewithtimestamp my-instance example-db
    querywithtimestamp my-instance example-db
    createtablewithtimestamp my-instance example-db
    writewithtimestamp my-instance example-db
    querysingerstable my-instance example-db
    queryperformancestable my-instance example-db
    writestructdata my-instance example-db
    querywithstruct my-instance example-db
    querywitharrayofstruct my-instance example-db
    querystructfield my-instance example-db
    querynestedstructfield my-instance example-db
    insertusingdml my-instance example-db
    updateusingdml my-instance example-db
    deleteusingdml my-instance example-db
    updateusingdmlwithtimestamp my-instance example-db
    writeandreadusingdml my-instance example-db
    updateusingdmlwithstruct my-instance example-db
    writeusingdml my-instance example-db
    querywithparameter my-instance example-db
    writewithtransactionusingdml my-instance example-db
    updateusingpartitioneddml my-instance example-db
    deleteusingpartitioneddml my-instance example-db
    updateusingbatchdml my-instance example-db
    createtablewithdatatypes my-instance example-db
    writedatatypesdata my-instance example-db
    querywitharray my-instance example-db
    querywithbool my-instance example-db
    querywithbytes my-instance example-db
    querywithdate my-instance example-db
    querywithfloat my-instance example-db
    querywithint my-instance example-db
    querywithstring my-instance example-db
    querywithtimestampparameter my-instance example-db
    clientwithqueryoptions my-instance example-db
    querywithqueryoptions my-instance example-db


Update readme to include sample operations.
Update readme to include sample operations.
