These are the public methods available in the library that you linked to
public:
// public methods
SoftI2CMaster();
SoftI2CMaster(uint8_t sclPin, uint8_t sdaPin);
SoftI2CMaster(uint8_t sclPin, uint8_t sdaPin, uint8_t usePullups);
void setPins(uint8_t sclPin, uint8_t sdaPin, uint8_t usePullups);
uint8_t beginTransmission(uint8_t address);
uint8_t beginTransmission(int address);
uint8_t endTransmission(void);
uint8_t send(uint8_t);
void send(uint8_t*, uint8_t);
void send(int);
void send(char*);
uint8_t requestFrom(int address);
uint8_t requestFrom(uint8_t address);
uint8_t receive( uint8_t ack );
uint8_t receive();
uint8_t receiveLast();