Merge pull request #9 from JosiahParry/msrv

update readme

README.md

@@ -2,15 +2,17 @@
 
 arrow-extendr is a crate that facilitates the transfer of [Apache Arrow](https://arrow.apache.org/) memory between R and Rust. It utilizes [extendr](https://extendr.github.io/), the [**`{nanoarrow}`**](https://arrow.apache.org/nanoarrow/0.3.0/r/index.html) R package, and [arrow-rs](https://docs.rs/arrow).
 
+
 ## Versioning
 
 At present, versions of arrow-rs are not compatible with each other. This means if your crate uses arrow-rs version `48.0.1`, then the arrow-extendr must also use that same version. As such, arrow-extendr uses the same versions as arrow-rs so that it is easy to match the required versions you need. 
 
 **Versions**:
 
+- 50.0.0 (compatible with geoarrow-rs 0.1.0)
+- 49.0.0-geoarrow (not available on crates.io but is the current Git version)
 - 48.0.1 
 - 49.0.0
-- 49.0.0-geoarrow (not available on crates.io but is the current Git version)
 
 ### Motivating Example
 
@@ -37,6 +39,10 @@ from an `&Robj`. In the function we instantiate a counter to keep track
 of the number of rows per chunk. For each chunk we print the number of rows.
 
 ```rust
+use extendr_api::prelude::*;
+use arrow_extendr::from::FromArrowRobj;
+use arrow::ffi_stream::ArrowArrayStreamReader;
+
 #[extendr]
 /// @export
 fn process_stream(stream: Robj) -> i32 {
@@ -71,4 +77,15 @@ process_stream(query)
 #> Found 256 rows
 #> Found 143 rows
 #> [1] 2959
-```
+```
+
+## Using arrow-extendr in a package
+
+To use arrow-extendr in an R package first create an R package and make it an extendr package with: 
+
+```r
+usethis::create_package("my_package")
+rextendr::use_extendr();
+```
+
+Next, you have to ensure that `nanoarrow` is a dependency of the package since arrow-extendr will call functions from nanoarrow to convert between R and Arrow memory. To do this run `usethis::use_package("nanoarrow")` to add it to your Imports field in the DESCRIPTION file.