add .gitignore file

Took 8 minutes

Author: DerFrZocker

.gitignore

@@ -0,0 +1,51 @@
+/.idea/
+/api/target/
+/api/.flattened-pom.xml
+/api/custom-ore-generator-api.iml
+/custom-ore-generator/target/
+/custom-ore-generator/.flattened-pom.xml
+/custom-ore-generator/custom-ore-generator.iml
+/impl/v1_8_R1/target/
+/impl/v1_8_R1/.flattened-pom.xml
+/impl/v1_8_R1/custom-ore-generator-impl-v1_8_R1.iml
+/impl/v1_8_R2/target/
+/impl/v1_8_R2/.flattened-pom.xml
+/impl/v1_8_R2/custom-ore-generator-impl-v1_8_R2.iml
+/impl/v1_8_R3/target/
+/impl/v1_8_R3/.flattened-pom.xml
+/impl/v1_8_R3/custom-ore-generator-impl-v1_8_R3.iml
+/impl/v1_9_R1/target/
+/impl/v1_9_R1/.flattened-pom.xml
+/impl/v1_9_R1/custom-ore-generator-impl-v1_9_R1.iml
+/impl/v1_9_R2/target/
+/impl/v1_9_R2/.flattened-pom.xml
+/impl/v1_9_R2/custom-ore-generator-impl-v1_9_R2.iml
+/impl/v1_10_R1/target/
+/impl/v1_10_R1/.flattened-pom.xml
+/impl/v1_10_R1/custom-ore-generator-impl-v1_10_R1.iml
+/impl/v1_11_R1/target/
+/impl/v1_11_R1/.flattened-pom.xml
+/impl/v1_11_R1/custom-ore-generator-impl-v1_11_R1.iml
+/impl/v1_12_R1/target/
+/impl/v1_12_R1/.flattened-pom.xml
+/impl/v1_12_R1/custom-ore-generator-impl-v1_12_R1.iml
+/impl/v1_13_R1/target/
+/impl/v1_13_R1/.flattened-pom.xml
+/impl/v1_13_R1/custom-ore-generator-impl-v1_13_R1.iml
+/impl/v1_13_R2/target/
+/impl/v1_13_R2/.flattened-pom.xml
+/impl/v1_13_R2/custom-ore-generator-impl-v1_13_R2.iml
+/impl/v1_13_R2-paper/lib/
+/impl/v1_13_R2-paper/target/
+/impl/v1_13_R2-paper/.flattened-pom.xml
+/impl/v1_13_R2-paper/custom-ore-generator-impl-v1_13_R2-paper.iml
+/impl/v1_14_R1/target/
+/impl/v1_14_R1/.flattened-pom.xml
+/impl/v1_14_R1/custom-ore-generator-impl-v1_14_R1.iml
+/impl/yaml/target/
+/impl/yaml/.flattened-pom.xml
+/impl/yaml/custom-ore-generator-impl-yaml.iml
+/impl/.flattened-pom.xml
+/impl/custom-ore-generator-impl.iml
+/.flattened-pom.xml
+/custom-ore-generator-parent.iml