docs: Added README

Author: quintesse

README.md

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+# Java Properties
+
+Java Properties is a drop-in replacement of the ubiquitous
+[`java.util.Properties`](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Properties.html)
+that everybody knows and loves (hates?).
+
+It's an alternative implementation whose most important advantage over its standard Java sibling is that
+it fully supports comments in input **and** output.
+
+Meaning that a properties table like this can not only be read, but also created, changed
+and be written back without losing any of the comments or formatting.
+
+```properties
+# Server configuration file
+
+# Host name for remote server
+remoteHost=myserver.example.com
+
+# Port number
+remotePort=8080
+
+# Password hash algorithm to use
+# (choose between MD5, SHA256 or SHA512)
+passwordHash=SHA512
+```
+### Setup
+
+Add it to your build file with:
+
+```xml
+<dependency>
+    <groupId>org.codejive</groupId>
+    <artifactId>java-properties</artifactId>
+    <version>0.0.2</version>
+</dependency>
+```
+
+or
+
+```groovy
+implementation 'org.codejive:java-properties:0.0.2'
+```
+
+And add this import to your code:
+
+```java
+import org.codejive.Properties;
+```
+
+### Usage
+
+After which you can do something like:
+
+```java
+Properties p = new Properties();
+p.setProperty("port", "8080");
+p.setComment("port", "Port number to use for the server");
+```
+
+or just directly in a single line:
+
+```java
+Properties p = new Properties();
+p.setProperty("port", "8080", "Port number to use for the server");
+```
+
+And if you would write this out:
+
+```java
+p.store(System.out)
+```
+
+you'll get:
+
+```properties
+# Port number to use for the server
+port=8080
+```
+
+You can also set multi-line comments simply like this:
+
+```java
+p.setComment("port", "Port number to", "use for the server");
+p.setProperty("port", "8080", "Port number to", "use for the server");
+```
+
+which would both result in:
+
+```properties
+# Port number to
+# use for the server
+port=8080
+```
+
+Retrieving values is simple:
+
+```java
+p.get("port"); // Returns "8080"
+p.getProperty("port"); // Also returns "8080"
+p.getComment("port") // Returns ["Port number to", "use for the server"]
+```
+
+### Comments
+
+Comments are considered either "free" or "attached", which you could see as either being
+just part of the file or attached to a property. For example:
+
+```properties
+# A header comment (free)
+
+one=First value (that has no comment)
+
+# Another free comment
+
+# An attached comment
+two=Second value
+```
+
+Any comments that directly precede a property, so no empty lines in between, are considered
+"attached" to that property, which also means the comment can be retrieved using `props.getComment(key)`.
+On the other hand "free" comments are not attached to anything and there's no way to retrieve their
+values except when they are written out using `store()` or `list()`.
+
+This is also the reason that, when using `store()` with a comment, eg. `props.store(out, "The first line")`,
+it will actually insert an empty line after that comment, so it won't be considered attached to
+the first property.
+
+Another thing to take into account is that when retrieving comment, by using `getComment(key)`, you'll get a
+list of strings that will include the comment character. So, for example in the table above, running
+`getComment("two")` will return `"# An attached comment"`.
+
+In the same way, when setting comments, either by using `setComment(key, comment)` or
+`setProperty(key, value, comment)`, the comment lines are expected to start with a comment character.
+Fortunately, it isn't an error to pass in lines that do not start with a comment character and the code will
+try its best to figure out what comment character to use and prepend that to the lines.
+
+### Compatibility
+
+The `org.codejive.Properties` class is mostly a drop-in replacement of `java.util.Properties` with only
+a couple of differences:
+
+ - the API now uses `String` everywhere instead of having `Object` in certain places
+ - the class does **not** extend `Hashtable`, it's a completely outdated class that shouldn't be used anymore
+ - the `store()` methods do **not** write a timestamp at the top of the output
+ - the `store()` methods **will** write an empty line between any comments at the top of the output and the actual data
+
+### Development
+
+To build the project simply run:
+
+```shell
+./mvnw spotless:apply clean install
+```