Adding CRAN comments

.Rbuildignore

@@ -9,3 +9,4 @@
 ^dev$
 ^doc$
 ^Meta$
+^cran-comments\.md$

cran-comments.md

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+## Summary of new changes
+
+* Added a `NEWS.md` file to track changes to the package.
+
+* Added a `pkgdown` site for the package.
+
+* `ipd()` now allows for regression through the origin with `intercept = FALSE` argument.
+
+* `ipd()` now takes an additional argument, `na_action`, to handle missing covariate data.
+
+  * Currently supports `"na.fail"` and `"na.omit"`. Defaults to `na.fail`.
+
+  * Provides a more informative error message and lists which covariates are missing observations.
+
+* `ipd()` now takes an additional argument, `n_t`, which denotes the (optional) size of the training set used to generate the prediction rule. Defaults to `Inf` but is necessary for the `postpi_X` methods if `n_t` < `n`, `N`, the number of labeled and unlabeled observations, respectively, in the data being analyzed.
+
+## R CMD check results
+
+── R CMD check results ────────────────────────────────────────────────────────────────────────────────── ipd 0.1.3 ────
+Duration: 3m 51.3s
+
+0 errors ✔ | 0 warnings ✔ | 0 notes ✔
+
+## Downstream dependencies
+
+character(0)