Chap 1 & Chap 2 代码及文档

[K4pMerlin]

更新了第一章，第二章的代码，文档内容，使用RStudio编写。
环境如下：

> sessionInfo()
R version 4.3.0 (2023-04-21 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 11 x64 (build 22621)

Matrix products: default


locale:
[1] LC_COLLATE=Chinese (Simplified)_China.utf8  LC_CTYPE=Chinese (Simplified)_China.utf8   
[3] LC_MONETARY=Chinese (Simplified)_China.utf8 LC_NUMERIC=C                               
[5] LC_TIME=Chinese (Simplified)_China.utf8    

time zone: Asia/Shanghai
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] digest_0.6.31    utf8_1.2.3       R6_2.5.1         fastmap_1.1.1    xfun_0.39        tidyselect_1.2.0
 [7] magrittr_2.0.3   glue_1.6.2       tibble_3.2.1     knitr_1.43       htmltools_0.5.5  pkgconfig_2.0.3 
[13] rmarkdown_2.21   dplyr_1.1.2      generics_0.1.3   lifecycle_1.0.3  cli_3.6.1        fansi_1.0.4     
[19] vctrs_0.6.2      compiler_4.3.0   purrr_1.0.1      rstudioapi_0.14  tools_4.3.0      evaluate_0.21   
[25] pillar_1.9.0     yaml_2.3.7       rlang_1.1.1