Adds some example .monster files.

monsters/shadow demon.monster

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+{"name":"Shadow Demon","size":"medium","type":"fiend","tag":"","alignment":"chaotic evil","hitDice":"12","armorName":"other","shieldBonus":0,"natArmorBonus":4,"otherArmorDesc":"13","speed":"30","burrowSpeed":"0","climbSpeed":"0","flySpeed":"30","hover":false,"swimSpeed":"0","customHP":false,"customSpeed":false,"hpText":"45 (7d8 + 14)","speedDesc":"50 ft.","strPoints":"1","dexPoints":"17","conPoints":"12","intPoints":"14","wisPoints":"13","chaPoints":"14","blindsight":"0","blind":false,"darkvision":"120","tremorsense":"0","truesight":"0","telepathy":120,"cr":"4","customCr":"3 (700 XP)","customProf":2,"isLegendary":false,"legendariesDescription":"The hell hound can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The hell hound regains spent legendary actions at the start of its turn.","isLair":false,"lairDescription":"When fighting inside its lair, the hell hound can invoke the ambient magic to take lair actions. On initiative count 20 (losing initiative ties), the hell hound can take one lair action to cause one of the following effects:","lairDescriptionEnd":"The hell hound can't repeat an effect until they have all been used, and it can't use the same effect two rounds in a row.","isRegional":false,"regionalDescription":"The region containing the hell hound's lair is warped by the creature's presence, which creates one or more of the following effects:","regionalDescriptionEnd":"If the hell hound dies, the first two effects fade over the course of 3d10 days.","properties":[],"abilities":[{"name":"Incorporeal Movement","desc":"The demon can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object."},{"name":"Light Sensitivity","desc":"While in bright light, the demon has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight."},{"name":"Shadow Stealth","desc":"While in dim light or darkness, the demon can take the Hide action as a bonus action."}],"actions":[{"name":"Claws","desc":"_Melee Weapon Attack_: +5 to hit, reach 5 ft., one creature. _Hit_: 10 (2d6 + 3) psychic damage or, if the demon had advantage on the attack roll, 17 (4d6 + 3) psychic damage."}],"reactions":[],"legendaries":[],"lairs":[],"regionals":[],"sthrows":[{"name":"dex","order":1},{"name":"cha","order":5}],"skills":[{"name":"stealth","stat":"dex","note":" (ex)"}],"damagetypes":[],"specialdamage":[],"conditions":[{"name":"exhaustion"},{"name":"grappled"},{"name":"paralyzed"},{"name":"petrified"},{"name":"poisoned"},{"name":"prone"},{"name":"restrained"}],"languages":[{"name":"Abyssal","speaks":true}],"understandsBut":"","shortName":"","doubleColumns":false,"separationPoint":1,"damage":[]}