Improved readme.

.gitignore

@@ -1,2 +1,3 @@
 .idea/
-target/
+target/
+materials-extractor.jar

README.md

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 # MaterialsExtractor
 Program to extract a list of materials from an NBT structure file.
+
+## Usage
+```shell
+git clone git@github.com:andrewlalis/MaterialsExtractor.git
+cd MaterialsExtractor
+./build.sh
+```
+
+Usage information:
+```
+java -jar materials-extractor.jar <schematic-file.nbt> [paste.ee token]
+  Where
+    First argument (required) is the path to the .nbt schematic file to read.
+    Second argument (optional) is an api token to https://paste.ee, to
+      automatically upload item-list for usage.
+```

build.sh

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+#!/usr/bin/env bash
+
+./mvnw clean package
+cp target/materials-extractor-*-jar-with-dependencies.jar ./materials-extractor.jar
+
+echo "Built project as materials-extractor.jar"
+echo "Run: java -jar materials-extractor.jar <schematic-file.nbt> [paste.ee token]"