Initialize Project and add Solution for day 1 part 1

.gitignore

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+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+
+# Eclipse m2e generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+# Intellij Idea
+.idea

README.md

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+# Advent of Code in Java ☕
+
+## Usage
+1. fork this Repository
+2. Install dependencies
+    - [Maven](https://maven.apache.org/install.html)
+    - [Java 17](https://www.oracle.com/java/technologies/downloads/#java17)
+3. Create file `day1.txt` with puzzle input in `input` folder
+4. Run the project 🚀 with `mvn package && java -cp target/AdventOfCode-1.0-SNAPSHOT.jar de.dhbw.horb.App`
+    - or open and run in your favorite IDE

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>de.dhbw.horb</groupId>
+  <artifactId>AdventOfCode</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>AdventOfCode</name>
+
+  <properties>
+	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	<maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+  </properties>
+</project>

src/main/java/de/dhbw/horb/App.java

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+package de.dhbw.horb;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+/**
+ * Advent of Code with sample Solution for Day 1 (Part 1)
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        String input = readInput("day1.txt");
+        int total = 0;
+        for(String line : input.split("\n")) {
+            char last = 0;
+            char first = 0;
+            //Get last number
+            for(int i = 0; i < line.length(); i++){
+                char c = line.charAt(i);
+                if(Character.isDigit(c)){
+                    last = c;
+                }
+            }
+            //Get first
+            for(int i = line.length() - 1; i >= 0; i--){
+                char c = line.charAt(i);
+                if(Character.isDigit(c)){
+                    first = c;
+                }
+            }
+            //Parse and add:
+            total += Integer.parseInt(Character.toString(first) + Character.toString(last));
+        }
+        System.out.println(total);
+    }
+
+    public static String readInput(String filename) {
+        try{
+            return Files.readString(Paths.get(System.getProperty("user.dir"), "input", filename));
+        } catch (IOException e){
+            throw new RuntimeException(e);
+        }
+    }
+}