Format docs/RUN.md

Author: mdhvg

docs/RUN.md

@@ -1,6 +1,14 @@
-How to run portable version on Linux
-=======
+# Instructions to run XOpcodeCalc
 
-- download an appImage file (https://github.com/horsicq/XOpcodeCalc/releases/download/0.05/XOpcodeCalc-0.05-x86_64.AppImage)
-- make the file executable (chmod +x XOpcodeCalc-0.05-x86_64.AppImage)
-- run it (./XOpcodeCalc-0.05-x86_64.AppImage)
+## Portable Version on Linux
+Download an [appImage file](https://github.com/horsicq/XOpcodeCalc/releases/download/0.05/XOpcodeCalc-0.05-x86_64.AppImage)
+
+Make the file executable
+```bash
+chmod +x XOpcodeCalc-0.05-x86_64.AppImage
+```
+
+Run it
+```bash
+./XOpcodeCalc-0.05-x86_64.AppImage
+```