Update version number to 1.2.0 according to Bioconductor instruction (2021-06-10) + Submitted to Bioconductor

Changes in version 0.2.0 (2021-01-10) + Added new Vignettes “community structure inference”

Release version 0.2.0 (2020-12-04) + Buidling website. + Made the following changes o Kernel method o Adding tutorials