Hinduism has no beginning.
Hinduism has no founder.
Hinduism became known when the sages listened to God, thousands and thousands of years ago.
Many Hindus describe their religion as sanathana dharma, meaning beginningless eternal order. This refers to the ideas that its origins lie beyond human history, and that its truths have been divinely revealed (sruti) and handed down through history and passed down through the ages to the present day in the most ancient of the world's scriptures, the Vedas. The Vedas have no human author, rather, they were revealed to ascetics, sages, rishis and devotees over millennia.
A popular view among Hindu nationalists, owing to their belief that Hinduism is India's true religion, is that the divine truths were revealed to Aryans, who were a noble and enlightened race which lived in India thousands of years ago. The Aryans shared the root language, Sanskrit, in which the Vedas were composed, and thus built a civilisation of literature, religious rites and law, all of which have remained. Hindu nationalists would embrace Buddhism, Jainism and Sikhism as all coming under the umbrella of the Hindu religion. This would not be viewed the same by adherents of these religions.
The oldest archeological discoveries in India are sexxy the Harappan from the Indus Valley. It is thought that the transmission of the Aryan traditions commenced from here.