add lcs2 (#79)

* add lcs2

* update readme

* add comments

Author: leohhhn

live-coding/2-home-realm/README.md

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+# Gno Live Coding Session #2
+
+#### Topic: A gno.land home realm
+#### Date: Friday, Aug 30th 2024
+#### Presenter: [@leohhhn](https://github.com/leohhhn)
+
+This live coding session showed attendees how to build their own home realm for 
+gno.land.
+
+The home realm for gno.land is meant to be similar to what a GitHub profile page
+is for GitHub. It's personal, and it includes information about the user.
+
+In this specific example, we create a home realm that adds an image, text about 
+the user, and also showcases dynamic imports of `r/demo/art` realms. All of this
+is then combined into an output to showcase how the `Render()` function works
+in Gno.
+
+## Following up
+
+We encourage anyone who wishes to build upon the example given in the coding
+session to do so. Please make a PR adding your code to the 
+[`followup-work/`](./followup-work) folder, and ping the presenter.
+
+## Video
+
+Video recording will be uploaded soon.

live-coding/2-home-realm/code/r/leon/config/config.gno

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+// Package config is simply Leon's configuration file.
+// It can be used externally to dynamically give Leon the rights to call something;
+// Say, an admin variable can be set to r/leon/config.Address(). Then, Leon can
+// update his address and still retain admin priveleges.
+package config
+
+import (
+	"errors"
+	"std"
+)
+
+var (
+	main   std.Address
+	backup std.Address
+)
+
+func init() {
+	main = "g125em6arxsnj49vx35f0n0z34putv5ty3376fg5" // registered to @leon
+}
+
+func Address() std.Address {
+	return main
+}
+
+func Backup() std.Address {
+	return backup
+}
+
+func SetAddress(newAddr std.Address) {
+	AssertAuthorized()
+	if !newAddr.IsValid() {
+		panic("config: invalid address")
+	}
+
+	main = newAddr
+}
+
+func SetBackup(newAddr std.Address) {
+	AssertAuthorized()
+	if !newAddr.IsValid() {
+		panic("config: invalid address")
+	}
+
+	backup = newAddr
+}
+
+func CheckAuthorized() error {
+	caller := std.PrevRealm().Addr()
+
+	if caller != main || caller != backup {
+		return errors.New("config: unauthorized")
+	}
+
+	return nil
+}
+
+func AssertAuthorized() {
+	caller := std.PrevRealm().Addr()
+
+	if caller != main || caller != backup {
+		panic("config: unauthorized")
+	}
+}
+
+// Possible improvements
+// Add errors, add a non-panicking function for Authorized

live-coding/2-home-realm/code/r/leon/config/gno.mod

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+module gno.land/r/leon/config

live-coding/2-home-realm/code/r/leon/home/gno.mod

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+module gno.land/r/leon/home
+
+require (
+	gno.land/p/demo/ufmt v0.0.0-latest
+	gno.land/r/demo/art/gnoface v0.0.0-latest
+	gno.land/r/leon/config v0.0.0-latest
+)

live-coding/2-home-realm/code/r/leon/home/home.gno

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+// Package home is Leon's personal home realm, deployed under gno.land/r/leon/home
+// It is meant to act as Leon's profile page on gno.land
+package home
+
+import (
+	"std"
+	"strconv"
+
+	"gno.land/p/demo/ufmt"
+	"gno.land/r/demo/art/gnoface"
+	"gno.land/r/demo/art/millipede"
+	"gno.land/r/leon/config"
+)
+
+var (
+	pfp        string // link to my profile pic
+	pfpCaption string
+	abtMe      [2]string
+)
+
+func init() {
+	pfp = "https://i.imgflip.com/91vskx.jpg"
+	pfpCaption = "[My favourite painting & pfp](https://en.wikipedia.org/wiki/Wanderer_above_the_Sea_of_Fog)"
+	abtMe = [2]string{
+		`### About me
+Hi, I'm Leon, a DevRel Engineer at gno.land. I am a tech enthusiast, 
+life-long learner, and sharer of knowledge.`,
+		`### Contributions
+My contributions to gno.land can mainly be found 
+[here](https://github.com/gnolang/gno/issues?q=sort:updated-desc+author:leohhhn).
+
+TODO import r/gh`,
+	}
+}
+
+// Updating
+
+func UpdateAbtMe(col1, col2 string) {
+	config.AssertAuthorized()
+	abtMe[0] = col1
+	abtMe[1] = col2
+}
+
+// Todo: make setters for all pkg-level variables
+
+// Rendering
+
+func Render(_ string) string {
+	output := "# Leon's Homepage\n\n"
+
+	output += renderAboutMe()
+	output += "\n\n"
+	output += renderArt()
+
+	return output
+}
+
+func renderAboutMe() string {
+	out := "<div class='columns-3'>"
+
+	out += "<div>\n\n"
+	out += ufmt.Sprintf("![](%s)\n\n%s\n\n", pfp, pfpCaption)
+	out += "</div>\n\n"
+
+	out += "<div>\n\n"
+	out += abtMe[0] + "\n\n"
+	out += "</div>\n\n"
+
+	out += "<div>\n\n"
+	out += abtMe[1] + "\n\n"
+	out += "</div>\n\n"
+
+	out += "</div>"
+	return out
+}
+
+func renderArt() string {
+	out := `<div class=jumbotron>` + "\n\n"
+	out += "## Gno Art\n\n"
+	out += "<div class='columns-3'>"
+
+	out += renderGnoFace()
+	out += renderMillipede()
+	out += renderGnoFace()
+
+	out += "</div><!-- /columns-3 -->"
+	out += "</div><!-- /jumbotron -->"
+
+	return out
+}
+
+func renderGnoFace() string {
+	out := "<div>\n\n"
+	out += gnoface.Render(strconv.Itoa(int(std.GetHeight())))
+	out += "</div>\n\n"
+
+	return out
+}
+
+func renderMillipede() string {
+	out := "<div>\n\n"
+	out += "Millipede\n\n"
+	out += "```\n" + millipede.Draw(int(std.GetHeight()%10+1)) + "```\n"
+	out += "</div>\n\n"
+
+	return out
+}

live-coding/2-home-realm/followup-work/README.md

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+# Followup work
+
+To add your code for this GnoLCS, create a directory named after your GitHub username
+under this folder.
+