init research

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+[//]: # (title: insert)
+
+<!---IMPORT org.jetbrains.kotlinx.dataframe.samples.api.Modify-->
+
+Inserts new column at specific position in [`DataFrame`](DataFrame.md). 
+
+```text
+insert 
+    (columnName) { rowExpression } | (column)
+    .under { parentColumn } | .after { column } | .at(position)
+
+rowExpression: DataRow.(DataRow) -> Value
+```
+
+Similar to [add](add.md), but supports column positioning.
+
+Create new column based on existing columns and insert it into [`DataFrame`](DataFrame.md):
+
+**Related operations**: [](insertReplace.md)
+
+<!---FUN insert-->
+<tabs>
+<tab title="Properties">
+
+```kotlin
+df.insert("year of birth") { 2021 - age }.after { age }
+```
+
+</tab>
+<tab title="Strings">
+
+```kotlin
+df.insert("year of birth") { 2021 - "age"<Int>() }.after("age")
+```
+
+</tab></tabs>
+<inline-frame src="resources/org.jetbrains.kotlinx.dataframe.samples.api.Modify.insert.html" width="100%"/>
+<!---END-->
+
+Insert previously created column:
+
+<!---FUN insertColumn-->
+
+```kotlin
+val score by columnOf(4, 5, 3, 5, 4, 5, 3)
+df.insert(score).at(2)
+```
+
+<inline-frame src="resources/org.jetbrains.kotlinx.dataframe.samples.api.Modify.insertColumn.html" width="100%"/>
+<!---END-->