Add link to installers, add docs for requirement of java9+ for development environments (#3299)

* Fix parts of issue 3298

* Specify that is for development environments, not runtime environments

docs/getting-setup.md

@@ -28,6 +28,9 @@ To get started you will need Java, Scala, and some other nice tools installed, l
 
 Simply follow the instructions in [this short blog](https://www.scala-lang.org/2020/06/29/one-click-install.html) to get started.
 
+>bitcoin-s requires java9+ for development environments. If you do not have java9+ installed, you will not be able to build bitcoin-s.
+[You will run into this error if you are on java8 or lower](https://github.com/bitcoin-s/bitcoin-s/issues/3298)
+
 ## Step 2: Bitcoin-S Repository
 
 Now, it is time to clone the [Bitcoin-S repository](https://github.com/bitcoin-s/bitcoin-s/) by running

docs/getting-started.md

@@ -20,9 +20,22 @@ have feedback on how to make your lives easier, please reach out on [slack](http
 ### Java binaries
 
 <details>
-Please download these from our latest release on github 
 
-https://github.com/bitcoin-s/bitcoin-s/releases/tag/v0.6.0
+#### Latest release
+
+Please see the release page on github, you can find it [here](https://github.com/bitcoin-s/bitcoin-s/releases)
+
+#### Master builds
+
+We build installers for mac, linux and windows everytime a PR is merged to master.
+
+You can find the latest builds at this link: 
+
+https://github.com/bitcoin-s/bitcoin-s/actions/workflows/release.yml
+
+Here is what the installers look like
+
+![installers](Screenshot%20from%202021-06-18%2013-10-40.png)
 
 </details>