Add a component to render a markdown file from url

src/components/Screens/MarkdownRenderScreen.js

@@ -0,0 +1,47 @@
+import React from 'react';
+import Markdown from "react-native-markdown-display";
+import {withTheme} from "react-native-paper";
+/**
+ * Read a text file and output the content
+ *
+ * Example Usage:
+ * var myTxt = require("./myTxt.txt");
+ * ...
+ * <TextFileReader
+        txt={myTxt}
+   />
+ */
+class TextFileReader extends React.Component {
+    constructor(props) {
+        super(props);
+        this.state = {
+            text: ""
+        };
+    }
+
+    componentDidMount() {
+        this.readTextFile(this.props.text);
+    }
+
+    readTextFile = file => {
+        let xhr = new XMLHttpRequest();
+        xhr.open("GET", file, true);
+        xhr.onreadystatechange = () => {
+            if(xhr.readyState === 4 && xhr.status === 200){
+                const allText = xhr.responseText;
+                this.setState({
+                    text: allText
+                });
+            }
+        };
+        xhr.send(null);
+    };
+
+    render(){
+        return (
+            <Markdown>{this.state.text}</Markdown>
+        )
+    }
+}
+
+export default withTheme(TextFileReader);