UPDATE: text changes in some sections, adds placeholder pages

docs/src/tironcalc/about.md

@@ -9,3 +9,14 @@ lang: en-US
 ::: warning
 **Note:** This page is in construction 🚧
 :::
+
+# About TironCalc
+
+**TironCalc**, or **Tiron** for friends, is a TUI (Terminal User Interface) for **IronCalc**. It’s designed to bring the functionality of IronCalc to the command line, using the [**ratatui**](https://github.com/ratatui-org/ratatui) library.
+
+## Inspiration
+
+TironCalc is inspired by earlier terminal-based spreadsheet tools:
+
+- James Gosling of Java fame created [sc](<https://en.wikipedia.org/wiki/Sc_(spreadsheet_calculator)>) the spreadsheet calculator.
+- Andrés Martinelli has been maintaining [sc-im](https://github.com/andmarti1424/sc-im), the spreadsheet calculator improvised.

docs/src/tironcalc/installing.md

@@ -6,6 +6,32 @@ lang: en-US
 
 # Installing and running Tironcalc
 
-::: warning
-**Note:** This page is in construction 🚧
-:::
+## Build
+
+```
+cargo build --release
+```
+
+You will find the binary at `./target/release/tiron`.
+
+## Documentation
+
+Start empty project:
+
+```
+$ tiron
+```
+
+Load an existing Excel file:
+
+```
+$ tiron example.xlsx
+```
+
+- `Arrow Keys` to navigate cells
+- `e` to edit a cell and enter the value or formula.
+- `q` to quit and save
+- `+` to add a sheet
+- `s` to go to the next sheet
+- `a` to go to the previous sheet
+- `PgUp/PgDown` to navigate rows faster