add package information

Author: mutec

README.md

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+de.mysterycode.wcf.codemirror || CodeMirror
+====================================
+Implementation of the code editor [CodeMirror](https://github.com/codemirror/CodeMirror).
+
+API
+---
+In order to include the CodeMirror editor use:
+
+`{include file='codemirror' codemirrorMode='language' codemirrorSelector='id of your textarea'}`
+
+**Example:**
+```
+<section class="section marginTop">
+    <legend>An awesome section-title</legend>
+    
+    <dl class="wide">
+        <dt>Your message in here:</dt>
+        <dd>
+            <textarea id="scss" name="scss">/* some SCSS seclarations */</textarea>
+            {include file='codemirror' codemirrorMode='text/x-less' codemirrorSelector='scss'}
+        </dd>
+    </dl>
+</section>
+```
+
+Version
+---
+CodeMirror-Version: 5.62.3
+
+Basic Support
+-------------
+If you have trouble including the CodeMirror editor or questions feel free to ask me: [Forum](https://support.mysterycode.de/)
+
+If you got questions about CodeMirror itself, please visit their [GitHub Repository](https://github.com/codemirror/CodeMirror).
+
+License
+-------
+CodeMirror is licensed under [MIT License](https://github.com/codemirror/CodeMirror/blob/master/LICENSE)

package.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<package name="de.mysterycode.wcf.codemirror" xmlns="http://www.woltlab.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.woltlab.com https://www.woltlab.com/XSD/5.4/package.xsd">
+	<packageinformation>
+		<packagename>CodeMirror</packagename>
+		<packagedescription><![CDATA[Implements CodeMirror]]></packagedescription>
+		<version>1.0.0</version>
+		<date>2021-09-11</date>
+	</packageinformation>
+	
+	<authorinformation>
+		<author><![CDATA[Florian Gail]]></author>
+		<authorurl><![CDATA[https://www.mysterycode.de]]></authorurl>
+	</authorinformation>
+	
+	<requiredpackages>
+		<requiredpackage minversion="5.4.0">com.woltlab.wcf</requiredpackage>
+	</requiredpackages>
+	
+	<excludedpackages>
+		<excludedpackage version="5.5.0 Alpha 1">com.woltlab.wcf</excludedpackage>
+	</excludedpackages>
+	
+	<instructions type="install">
+		<instruction type="file" />
+		<instruction type="acpTemplate" />
+		<instruction type="template" />
+	</instructions>
+</package>