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Update THEORY.md

Add seven segment display

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`@@ -44,8 +44,29 @@ To avoid these erroneous readings, we use the pull up or pull down resistance.`
`44`	`44`	`##Four terminal push button`
`45`	`45`
`46`	`46`	`<palign="center">`
`47`		`-<imgsrc="images/4-terminal-push-button.jfif"width="300"/>`
	`47`	`+<imgsrc="images/4-terminal-push-button.jfif"width="300"/>`
	`48`	`+`
	`49`	`+##Seven segment display`
	`50`	`+`
	`51`	`+Consists of seven LEDs arranged in a rectagular fashion as shown. Each of the seven LEDs is called a segment because when illuminated, the segment forms part of an alphanumerical digit to be displayed.`
	`52`	`+An additional 8th LED is sometimes used to display decimal numbers.`
	`53`	`+`
	`54`	`+<palign="center">`
	`55`	`+<imgsrc="images/numbers-7-segment-display.jpg"width="300"/>`
	`56`	`+`
	`57`	`+There are two types of display:`
	`58`	`+`
	`59`	`+-__Common Anode__:`
	`60`	`+`
	`61`	`+<palign="center">`
	`62`	`+<imgsrc="images/common-anode-7-segment-display.jpg"width="300"/>`
	`63`	`+`
	`64`	`+-__Common Cathode__:`
	`65`	`+`
	`66`	`+ <palign="center">`
	`67`	`+<imgsrc="images/common-cathode-7-segment-display.jpg"width="300"/>`
`48`	`68`
`49`	`69`	`##Source`
`50`	`70`	`-https://www.fisic.ch/contenidos/electricidad/ley-de-ohm-y-resistencia/`
`51`		`--http://slotsyrockolas.blogspot.com/p/el-led.html`
	`71`	`+-http://slotsyrockolas.blogspot.com/p/el-led.html`
	`72`	`+-https://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html`

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