Update README.md (#2)

Included Build Instructions section.

README.md

@@ -13,6 +13,20 @@ to retrieve values from specific fields of a given HL7 message natively, i.e., w
 the raw pipe-delimited message into another object oriented format. Because its using scala under the hood,
 this approach seems to be working very effectively and can return values very fast.
 
+# Build Instructions
+## Prerequisites
+- Java Development Kit (JDK) 11
+- Scala (Version) 2.13.10
+- SBT (Scala Build Tool)
+- GitHub Personal Access Token
+
+## Installation
+- Clone the repository: https://github.com/CDCgov/hl7-pet.git
+- Create GITHUB_TOKEN from your personal GithHub Settings>Developer Settings->Personal Access Tokens>Generate New Token(with any scope), set it as environment variable and update the build.sbt file accordingly
+- Build the project
+- from sbt terminal run 'package' command for jar file to be generated
+
+
 # Extracting Values from a HL7 message.
 
 For a code example on how to initialize the parser, look intot he ExampleApp under test/scala. 
@@ -111,4 +125,4 @@ Here's the list of available tools:<BR>
 * CSVReader:<BR>
     Simple class to read comma-delimited files (or any delimiter for that matter)
 * ConsoleProgress:<BR>
-    Class that shows dots in the console as feedback for the user that the app still working.       
+    Class that shows dots in the console as feedback for the user that the app still working.