add readme file

Author: Muhammad-Javad

README.md

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+# JCalendar
+
+JCalendar is an Android library for displaying one month later and a month ago from the device's current date.
+## Screenshot and gif
+
+
+## Installation
+
+Add Jitpack to your project build.gralde file.
+
+```groovy
+allprojects {
+   repositories {
+      ...
+      maven { url 'https://jitpack.io' }
+   }
+}
+```
+
+## Usage
+First of all, you must add JCalendar to your layout.
+```xml
+<androidx.constraintlayout.widget.ConstraintLayout 
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+        <com.javadsh98.jcalendar.JCalendarView
+        android:id="@+id/jcalendar"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+
+### Code
+you can access JCalendar in activity or fragment by following code.
+#### Kotlin
+```kotlin
+jcalendar
+    .setBackgroundResNormal(ResourcesCompat.getDrawable(resources, R.drawable.frm_item_normal, null)!!)
+    .setBackgroundResSelected(ResourcesCompat.getDrawable(resources, R.drawable.frm_item_selected, null)!!)
+    .setNameOfMonthTextColor(R.color.black_all)
+    .setNameOfWeekTextColorNormal(R.color.black_all)
+    .setDayOfMonthTextColorNormal(R.color.black_all)
+    .setNameOfWeekTextColorSelected(R.color.white_all)
+    .setDayOfMonthTextColorSelected(R.color.white_all)
+    .setJalaliListener(object : JJalaliListener {
+        override fun onJalali(date: String) {
+            textView_jalali.text = date
+        }
+    })
+    .setGregorianListener(object : JGregorianListener {
+        override fun onGregorian(date: String) {
+            textView_gregorian.text = date
+        }
+    })
+    .init()
+```
+#### Java
+``` java
+JCalendarView calendarView = findViewById(R.id.jcalendar);
+calendarView
+        .setBackgroundResNormal(ResourcesCompat.getDrawable(getResources(), R.drawable.frm_item_normal, null))
+        .setBackgroundResSelected(ResourcesCompat.getDrawable(getResources(), R.drawable.frm_item_selected, null))
+        .setNameOfMonthTextColor(R.color.black_all)
+        .setNameOfWeekTextColorNormal(R.color.black_all)
+        .setDayOfMonthTextColorNormal(R.color.black_all)
+        .setNameOfWeekTextColorSelected(R.color.white_all)
+        .setDayOfMonthTextColorSelected(R.color.white_all)
+        .setJalaliListener(new JJalaliListener() {
+            @Override
+            public void onJalali(@NotNull String date) {
+                TextView jalali = findViewById(R.id.textView_jalali);
+                jalali.setText(date);
+            }
+        })
+        .setGregorianListener(new JGregorianListener() {
+            @Override
+            public void onGregorian(@NotNull String date) {
+                TextView gregorian = findViewById(R.id.textView_gregorian);
+                gregorian.setText(date);
+            }
+        })
+        .init();
+```
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.
+## Related Links