add changelog and readme

Author: testica

.idea/codeStyles/Project.xml

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+# CHANGELOG
+
+## [1.0.0] - 2019-03-20
+- Add first stable version

CHANGELOG.md

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+# Code Editor
+[ ![Download](https://api.bintray.com/packages/testica-android/maven/codeeditor/images/download.svg) ](https://bintray.com/testica-android/maven/codeeditor/_latestVersion)
+
+Code Editor is an Android library that simplify the display of code, making easy syntax highlighting and showing number of lines.
+
+## Requirements
+- minSdkVersion 15
+- compileSdkVersion 28
+
+## Download
+
+Include into the build.gradle file:
+
+```groovy
+dependencies {
+    implementation 'me.testica:codeeditor:1.0.0'
+}
+```
+## Usage
+
+From layout:
+```xml
+<me.testica.codeeditor.Editor
+            android:id="@+id/editor"
+            app:textSize="16sp"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
+```
+
+Then, manipulate programmatically:
+
+Java:
+```java
+Editor editor = (Editor) findViewById(R.id.editor);
+editor.setText("Hello Android");
+```
+Kotlin:
+```kotlin
+editor.setText("Hello Android")
+```
+
+### Syntax Highlight Rules
+
+Define a list of rules using a regular expression and color
+
+Java:
+```java
+editor.setSyntaxHighlightRules(
+        new SyntaxHighlightRule("[0-9]*", "#00838f"),
+        new SyntaxHighlightRule("/\\\\*(?:.|[\\\\n\\\\r])*?\\\\*/|(?<!:)//.*", "#9ea7aa")
+);
+```
+Kotlin:
+```kotlin
+editor.setSyntaxHighlightRules(
+        SyntaxHighlightRule("[0-9]*", "#00838f"),
+        SyntaxHighlightRule("/\\\\*(?:.|[\\\\n\\\\r])*?\\\\*/|(?<!:)//.*", "#9ea7aa")
+)
+```
+**Keep in mind that lasts rules will overwrite the previous ones, so order is important.**
+
+### Customization
+
+From **xml** we can set:
+- `text`: text code as string
+- `textSize`: text dimension of text including number lines
+- `fontFamily`: typeface of text including number lines
+
+The same way we can set and get above attributes programmatically:
+- `setText(String)`
+- `setTextSize(Float)`
+- `setTypeface(Typeface)`
+
+Is it possible to customize the number lines or the code text separately? **Yes!**
+Programmatically we can get both widget reference and manipulate them:
+
+- `getEditText()`: returns an `EditText` superclass, with this we can handle the code view.
+- `getNumLinesView()`: returns a `TextView` superclass, with this we can handle the number lines view.
+
+Below an example changing the background color of number lines view and applying some padding to code view:
+
+Java:
+```java
+// changing text color and background color to number lines view
+editor.getNumLinesView().setBackgroundColor(Color.BLACK);
+editor.getNumLinesView().setTextColor(Color.WHITE);
+
+// applying left padding to code view
+editor.getEditText().setPadding(10, 0, 0, 0);
+```
+
+Kotlin:
+```kotlin
+// changing text color and background color to number lines view
+editor.getNumLinesView().apply { 
+    setBackgroundColor(Color.BLACK)
+    setTextColor(Color.WHITE)
+}
+
+// applying left padding to code view
+editor.getEditText().setPadding(10, 0, 0, 0)
+```
+
+You can see another approach inside **codeeditorexample/MainActivity** class.
+
+## Contribute
+
+I accept pull requests to fix, improve performance or well-situated feature! Feel free to submit one.
+
+## License MIT
+```
+MIT License
+
+Copyright (c) 2019 Leonardo Testa
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```